“I want to make sure Iran doesn’t get a nuclear weapon that they can use against Israel or any other country,” Kelly said in a brief interview. “I think it was a mistake to get out of the [2015 deal]. It was not perfect, but they’re much closer today [to a nuclear bomb].”

Other potential Democratic skeptics include those who voted against the original agreement and wanted to see the Biden administration follow through on its promise for a “longer, stronger” deal that includes additional protections against Iranian aggression.

Those lawmakers have raised concerns about the U.S. and its allies rolling back some of the Trump-era sanctions on the Islamic Revolutionary Guard Corps, an Iranian military unit that has been designated as a foreign terrorist organization.

“I’m disappointed because I wanted to see a longer, stronger agreement, and that’s not going to be the case,” said Sen. Ben Cardin (D-Md.), who also opposed the 2015 deal. But, he added, “I think at the end of the day the president will get his way.”