Republican Senator Joni Ernst says now is the wrong time to be negotiating a new Iran deal as Russia continues its lawless invasion of Ukraine and US adversaries are emboldened.

The Iowa senator made the comment in a twitter post on Thursday and shared a letter by a group of 46 US retired generals and admirals urging President Joe Biden and Congress to reject the new nuclear deal currently being negotiated with Iran.

In an open letter published on Wednesday, they said this “dangerous” agreement is “poised to instantly fuel explosive Iranian aggression and pave Iran’s path to become a nuclear power, threatening the American homeland and the very existence of America’s regional allies.”

Also on Thursday, Congressman Josh Gottheimer called on the administration not to make concessions to Iran to revive the nuclear deal, noting, “We must not cave to demands from Iran — the world’s leading state-sponsor of terror. It's time to stand strong against terrorists and protect American values and our allies.”

The New Jersey representative also warned against removing Iran’s Revolutionary Guard from the US list of foreign terrorist organizations and depending on Russia to handle the nuclear negotiations.

“We cannot lift the FTO designation from the IRGC, remove non-nuclear sanctions on Iran, or let Russia hijack the negotiations”, he tweeted.

Reports said on Thursday that conservative group America First Legal Foundation has notified the White House that it "intends to take legal action to block any Biden-Iran deal that is not submitted to Congress" for approval.