Allowing amendments would be a politically perilous move. Many of the changes under discussion would be difficult for members of both parties to vote against. But any amendment to the bill would sink the legislation, which was crafted with input from Sen. Bob Corker (R-Tenn.), Sen. Ben Cardin (D-Md.) and the White House.

Rep. Ron DeSantis (R-Fla.), a Senate candidate, released a list of amendments he is prepared to offer. One would require that Iran to “pay reparations for all U.S. servicemen killed or harmed in Iraq due directly or indirectly to the involvement of any Iranian funded or supported groups.” Another would bar the lifting of sanctions on Iran until it’s certified that it has shuttered its nuclear program. Another DeSantis proposal would require Iran to allow the International Atomic Energy Agency into “all Iranian military sites at any time.” The Republican also wants the Obama administration to make the “negotiating record” available for review by members of Congress.

In addition, the several dozen members of the House Freedom Caucus are pressing to include language that would force Iran to recognize Israel as a Jewish state, a measure first proposed by Florida Sen. Marco Rubio.