Sen. Pete Ricketts (R-NE) attempted to call up and pass by unanimous consent a resolution urging the United Kingdom, France and Germany to trigger the snapback of United Nations sanctions on Iran under the Joint Comprehensive Plan of Action “as soon as possible,” but was blocked by Sen. Rand Paul (R-KY).

“In order to seize this moment,” and capitalize on Iranian weakness, “the U.S. and our allies must impose maximum pressure to the highest extent possible to force Iran to agree to permanently and verifiably end its nuclear program, including its capacity to enrich,” Ricketts said on the Senate floor on Wednesday.

The option to invoke snapback is set to expire in mid-October, but Ricketts emphasized that the process will take at least 30 days to complete, and that Russia is set to assume the presidency of the U.N. Security Council in October, in which role it could delay the proceedings. European allies have reportedly set an August deadline to initiate snapback, but Ricketts argued that “timeline … leaves little room for error.”

“I stand to urge our European friends to hold the line” in upcoming talks with Iran, Ricketts said, warning that Iran is trying to buy time and delay snapback.

Paul warned that the U.S. attack on Iran might make Iran more resistant to U.S. demands and “may turn out to be a disaster” that prompts Iran to sprint to a nuclear weapon.

He argued that sanctions have never changed Iran’s behavior — a notion disputed by leaders on both sides of the aisle — and “are often counterproductive” in general. Paul also suggested that the U.S. is in no position to make any requests related to snapback since President Donald Trump removed the U.S. from the Iran nuclear deal in 2018.

“It is a bit inconsistent for us to be arguing that Europe should apply and adhere to the JCPOA, which we no longer participate in,” Paul said. “If the United States is no longer a member of the JCPOA, what gives Washington the right to advise those who remain in it to invoke certain mechanisms within the agreement?”

He requested the Ricketts resolution be modified to instead call for deescalation and diplomacy.

Ricketts responded that diplomacy without pressure is a failed concept.

Sen. Jim Risch (R-ID), the chairman of the Senate Foreign Relations Committee, also spoke on the Senate floor in support of Ricketts’ resolution.

“Over the last 10 years, Iran has enjoyed unwarranted sanctions relief and time is short before the opportunity expires to snap back sanctions,” Risch said. “We cannot afford to wait until the end of August. Initiating the snapback process would be the right and long overdue move.”