Sen. Chris Coons (D-DE), one of the leading foreign policy voices in the Democratic Party’s moderate wing, expressed concern over the weekend that any White House decision to move ahead with military action against Iran would deeply alienate leading European allies of the United States. 

“There are pretty stark early warning signs of some challenges where core allies do not share our priorities,” Coons told Jewish Insider following a weeklong trip to Europe, which included stops at the Munich Security Conference, along with meetings in Ukraine and Moldova with top European diplomats. 

“It leaves me genuinely concerned that if Trump goes ahead with a strike against Iran, it is not going to enjoy support from any of our core allies,” he continued. “That will make it harder, and it may deepen this growing challenge for us.”

Asked how he would like to see the Trump administration address the Iranian regime’s violent crackdown on protesters and its nuclear program, Coons urged the president to work with close allies to “ramp up pressure” on Tehran and explain his approach to the public. The Delaware senator also encouraged Trump to include Congress in his deliberations. 

“A) Consult Congress. B) Make a case to the American people about why this is in our national security interest,” Coons said. “C) Clarify what on earth he’s planning with this Board of Peace, which just launched with a massive pledge from the United States that none of us had heard of before he announced it,” he said, ostensibly referring to the $10 billion financial commitment Trump made to Gaza’s reconstruction. “And D) If he’s going to work with close allies to ramp up pressure to try and achieve something at the negotiating table, he should work with close allies.”

“He shouldn’t just fire off a bunch of missiles and assume that that’s going to be enough to achieve the result he wants,” he added.

Coons also highlighted growing transatlantic tensions over potential U.S. military action against Iran during discussions with European officials, who expressed worries about a brewing U.S.-U.K. dispute tied to the Chagos Islands.

The remote British Indian Ocean Territory is at the center of a 2025 agreement in which the U.K. agreed to transfer sovereignty of the island chain to Mauritius while securing a 99- or 100-year lease for the strategic Diego Garcia military base, a joint U.S.-U.K. facility long used by American forces.

The Trump administration initially signaled support for the deal, with the State Department affirming it last Tuesday. But one day later, President Donald Trump publicly urged Prime Minister Keir Starmer to scrap the arrangement and retain full control of the “strategically located” base, warning it could be needed if diplomacy with Iran fails.

The Times of London reported Thursday that the British government had informed Washington that week it would not permit U.S. strikes on Iran from Diego Garcia or the Royal Air Force’s Fairford station, which houses U.S. Air Force troops, in England.

Coons called the U.K.’s stance “striking.” 

Coons plays a unique role in today’s Democratic Party. He sits in the Senate seat held by former President Joe Biden for 36 years, and the two Delaware Democrats have a relationship that dates back four decades. 

In addition to being the ranking member on Defense Appropriations, the panel responsible for Pentagon funding, Coons is next in line to succeed retiring Sen. Jeanne Shaheen (D-NH) as the top Democrat on the Senate Foreign Relations Committee, a role Biden held in the early 2000s. The Delaware senator remains Biden’s most ardent defender in politics following his exit from public life, and continues to advocate in his role as a senior Democrat in Congress for the traditional foreign policy views the two men have long shared. 

He does so against the backdrop of the ongoing debate among Democrats about the future direction of the party, on foreign policy and otherwise, in the post-Biden era.

Alongside Coons in Munich were a handful of prominent Democrats believed to be considering presidential runs in 2028, including Rep. Alexandria Ocasio-Cortez (D-NY), Sens. Chris Murphy (D-CT), Ruben Gallego (D-AZ), Mark Kelly (D-AZ) and Elissa Slotkin (D-MI). Govs. Gretchen Whitmer of Michigan and Gavin Newsom of California and former Commerce Secretary Gina Raimondo. 

Among the possible presidential hopefuls, Ocasio-Cortez and Whitmer were criticized for being unprepared for the conference after struggling to answer questions on U.S. policy toward China and Ukraine. Meanwhile, Murphy and Ocasio-Cortez separately accused Israel of committing genocide in Gaza — appealing to a left-wing base that has made criticism of the Jewish state central to its foreign policy. 

Ocasio-Cortez later griped to The New York Times that her gaffes and perceived presidential ambitions overshadowed the message she was attempting to deliver on a major foreign policy stage. 

Asked about the large presence of potential Democratic presidential candidates in Munich,  Coons joked that he was “announcing my 2028 candidacy” before crediting his fellow Democrats for engaging closely on foreign policy issues.

“The reality is that over the last several cycles, I’ve been very encouraged to see governors, senators, former cabinet officials who are likely future presidential candidates invest the time in coming to Munich, coming to Davos, going to Halifax, going to Australia, because the threat environment for all of our countries has become more serious and more real,” Coons said. 

Coons also expressed concern about the hefty $850 billion budget for the Pentagon in the upcoming fiscal year,  noting the significantly increased funding is “a breathtaking amount of money, and there is a lot of skepticism on the part of Americans that it’s being well spent.”

“The average American needs to see good jobs and innovation coming out of this massive defense investment. If we focus only on buying American and only on American jobs, we will lose tactically, we will lose strategically, we will lose politically. To the extent we align together, there is a strong future for all of our countries as democracies to meet this moment and to deliver the innovation that this threat environment absolutely demands,” Coons said.