A number of Republican lawmakers rallied behind President Donald Trump’s military strikes against Iran on Saturday, while leading Democrats expressed quick and strident opposition to the administration’s decision to attack Iran.

Democrats are also demanding Congress reconvene promptly next week to vote on war powers resolutions to block further military operations in Iran without congressional approval. The resolutions were already expected to come up for votes in the coming week.

A few Democratic lawmakers sounded more open-minded about the attack against Tehran. Sen. John Fetterman (D-PA), one of the few foreign policy hawks in his party, said the president “was absolutely” correct to attack Iran in an appearance on Fox News. “God bless the United States, our great military, and Israel,” Fetterman said.

Rep. Greg Landsman (D-OH), who told Jewish Insider earlier this week that limited strikes on Iran could be necessary and productive, echoed that stance on Saturday. He said that he would oppose the war powers resolution.

“I hope these targeted strikes on the Iranian regime’s military assets end the regime’s mayhem and bloodshed and makes way for this lasting peace in the region,” Landsman said. “Thank you to our brave service members who are leading this effort, and I pray their work will finally free the people of Iran and those in the region from more violence or war. May peace emerge from all of this.”

Rep. Josh Gottheimer (D-NJ), who had been planning to oppose the war powers resolution, praised the attack while highlighting the administration’s obligations under the War Powers Act, which limits the duration for which the president can unilaterally commit forces to armed conflict without congressional approval.

“Today, the United States, with our key democratic ally Israel, took decisive action to defend our national security, fight terror, protect our allies and stand with the Iranian people who have been massacred in the streets for demanding freedom from the murderous Iranian regime,” Gottheimer said. “I applaud the extraordinary bravery and professionalism of our servicemembers and pray for their safety as Iran and its terrorist proxies retaliate against American bases and our partners in the region.”

“Confronting the Iranian threat is essential to America’s national security and to global stability. The world is safer because of the courage and skill of our service members. I am praying for their safety and the safety of all of our allies who have been targeted by Iranian retaliation,” he continued.

Sen. Jacky Rosen (D-NV) offered more muted support for the operation, praising U.S. servicemembers while saying she “stand[s] with the Iranian people in their hope for a better future and will continue to work in a bipartisan way in Congress to provide them the support they need.” She called for an immediate and detailed briefing on the administration’s plans, and highlighted Iran’s long record of malign activity and attacks on its own citizens.

But Rosen also warned against a protracted conflict and criticized the lack of congressional authorization.

Rep. Tom Suozzi (D-NY), among the most moderate Democrats in the House and a potential swing vote on the war powers resolution, said Trump needs to seek congressional authorization for the operation, while offering support for the administration’s goals.

“I agree with the President’s objectives that Iran can never be allowed to obtain nuclear capabilities. The President must now clearly define the national security objective and articulate his plan to avoid another costly, prolonged war in the Middle East,” Suozzi said. “Iran remains the leading state sponsor of terrorism in the region and must never be allowed to obtain a nuclear weapon. Preventing that outcome is vital to our national security, the safety of our allies, and the stability of the Middle East.”

Most of the leading voices in the Democratic Party, however, are rallying against the Iran attack.

Sen. Tim Kaine (D-VA), who is leading a war powers resolution in the Senate that he planned to call up for a vote next week, said in a statement, “Every single Senator needs to go on the record about this dangerous, unnecessary, and idiotic action,” calling the strikes a “colossal mistake,” accusing the president of having “learned nothing from decades of U.S. meddling in Iran and forever wars in the Middle East” and of being “mentally incapacitated.”

Rep. Ro Khanna (D-CA), who is leading similar legislation in the House, said that “the American people are tired of regime change wars that cost us billions of dollars and risk our lives. We don’t want to be at war with a country of 90 million people in the Middle East.”

Rep. Thomas Massie (R-KY), one of the few GOP isolationists in Congress and Khanna’s cosponsor on that resolution, also said he opposes the operation.

“This is not ‘America First,’” Massie said. “When Congress reconvenes, I will work with @RepRoKhanna to force a Congressional vote on war with Iran. The Constitution requires a vote, and your Representative needs to be on record as opposing or supporting this war.”

Rep. Warren Davidson (R-OH), another isolationist-minded Republican who indicated this week that he was leaning toward voting for the war powers resolution, sent similar signals on Saturday.

“We need a government small enough to fit within the Constitution. We need a government effective enough to solve problems and serve its own people. Or, we need a new Constitution,” Davidson said.

The House is not scheduled to reconvene until Wednesday.

Rep. Jim Himes (D-CT), the top Democrat on the House Intelligence Committee, who was one of the handful of congressional leaders briefed on the administration’s plans earlier this week, said that “everything I have heard from the administration before and after these strikes on Iran confirms this is a war of choice with no strategic endgame.”

He said he expressed his concerns to Secretary of State Marco Rubio during the briefing this week.

Republicans are largely lining up behind the administration, with the exception of Massie.

Sen. Lindsey Graham (R-SC), who had urged Trump to take action, praised the administration, saying Trump had “met the moment.”

“My mind is racing with the thought that the murderous ayatollah’s regime in Iran will soon be no more. The biggest change in the Middle East in a thousand years is upon us,” Graham said. “The likelihood of normalization between Saudi Arabia and Israel getting back on track is exceedingly high –  a subject I brought up last week to the key players in the region who concurred if the ayatollah goes down, historic peace advances.”

Graham met with leaders in Israel, Saudi Arabia and the United Arab Emirates this month and said on Fox News on Saturday morning that he plans to return soon. Following retaliatory strikes by Iran on U.S. military facilities in several Arab states, Saudi Arabia issued a statement condemning Iran and offering its support for measures the Arab states may take in response.

“This operation has been well-planned,” Graham continued. “It will be violent, extensive and I believe, at the end of the day, successful. Again the demise of the ayatollah’s regime with American blood on its hands is necessary and more than justified.”

He later urged Arab and other allies to “get behind President Trump and go all in to ensure the ayatollah’s Iran, which has become the largest state sponsor of terrorism in the world is no more.”

Sen. Tom Cotton (R-AR), the chairman of the Senate Intelligence Committee, who was also briefed, said, “The butcher’s bill has finally come due for the ayatollahs. May God bless and protect our troops on this vital mission of vengeance, and justice, and safety,” highlighting the regime’s long record of attacks against Americans.

House Speaker Mike Johnson (R-LA) said Iran is “facing the severe consequences of its evil actions,” and said Trump had “made every effort” at diplomacy. “For decades, Iran has defiantly maintained its nuclear program while arming and funding Hamas, Hezbollah, and other internationally recognized terrorist organizations. Iran and its proxies have menaced America and American lives, undermined our core national interests, systematically destabilized the Middle East, and threatened the security of the entire West.”

“The Gang of 8 was briefed in detail earlier this week that military action may become necessary to protect American troops and American citizens in Iran. I received updates from Secretary Rubio thereafter, and I will remain in close contact with the President and the Department of War as this operation proceeds,” Johnson continued.

Other rank-and-file Democrats, including some moderates, drew parallels with the Bush administration’s war against Iraq in their criticism. 

Sen. Mark Warner (D-VA), the top Democrat on the Senate Intelligence Committee, said that the strikes raise “serious legal and constitutional concerns.”

“The American people have seen this playbook before — claims of urgency, misrepresented intelligence, and military action that pulls the United States into regime change and prolonged, costly nation-building,” Warner continued. “We owe it to our service members, and to every American family, to ensure that we are not repeating the mistakes of the past. The president owes the country clear answers: What is the objective? What is the strategy to prevent escalation? And how does this make Americans safer?”

Sen. Ruben Gallego (D-AZ), an Iraq war veteran representing a GOP-leaning state, expressed concern for U.S. forces, who Trump acknowledged could be lost in the ensuing war.

“I lost friends in Iraq to an illegal war. Young working-class kids should not pay the ultimate price for regime change and a war that hasn’t been explained or justified to the American people,” Gallego said. “We can support the democracy movement and the Iranian people without sending our troops to die.”

Rep. Brad Schneider (D-IL), a co-chair of the House Jewish caucus and a key pro-Israel leader, criticized the administration’s move and said he would support the war powers resolution. “The President of the United States is not allowed to take our nation to war without authorization from Congress.”

“This is a moment of peril and opportunity,” Schneider said. “Congress must step up to meet the moment, fulfill its constitutional duties, and ensure American action — with our allies in the region and around the world — leads to a more stable and peaceful Middle East, not another generational entanglement ending in failure.”

Former Rep. Elaine Luria (D-VA), among the House’s most vocal Democratic Iran hawks while she was in office and who is now running to reclaim her former seat, also said Congress should “immediately return to Washington” to vote on Kaine’s war powers resolution.

Rep. Jake Auchincloss (D-MA) said that Trump has “no credibility on either the strategy or law guiding foreign policy” — pointing to the president’s delayed promise to Iranian protesters earlier this year that help would be coming — and said he plans to support the war powers resolution.

“I am ready to work across the aisle to craft congressionally directed strategy on Iran, especially for securing American air supremacy in the region and supporting the Iranian people’s right to self determination,” Auchincloss said. “But first congressional Republicans must call the question on this fundamental issue of war powers by voting against a reckless commander-in-chief and for the Constitution.”