Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.) expressed “serious doubts” about the Senate's plans for the Iran nuclear deal after President Trump announced Friday he would be decertifying it and seeking changes from Congress.

“I know the White House has been working hard to craft a new law to fix the Iran deal, and I appreciate them and Chairman [Bob] Corker [R-Tenn.] seeking my input,” Rubio, a member of Corker's Foreign Relations Committee, said in a statement Friday. “I will reserve judgment until actual legislation is presented. But I have serious doubts about whether it is even possible to fix such a dangerously flawed agreement.”

On Friday, Trump declared the 2015 nuclear deal among Iran, the United States and five other world powers is no longer in U.S. national security interest.

In refusing to certify Iran’s compliance, Trump did not push Congress to reimpose nuclear sanctions. But he did ask that they amend the Iran Nuclear Agreement Review Act (INARA) to address his issues with it.

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To that end, Corker and Sen. Tom Cotton Tom Bryant CottonLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list Cruz says he wouldn't accept Supreme Court nomination MORE (R-Ark.) announced Friday that they will introduce legislation to amend INARA. Their bill would effectively end the so-called sunset provisions of the accord and automatically snap back nuclear sanctions if Iran gets within one year of obtaining a nuclear weapon.

In announcing the plan, Corker thanked Rubio for his help.

But Rubio said withdrawing from the deal may be the only course of action he’ll support.

“Ultimately, leaving the nuclear deal, re-imposing suspended sanctions and having the president impose additional sanctions would serve our national interest better than a decertified deal that leaves sanctions suspended or a new law that leaves major flaws in that agreement in place,” he said in his statement.

In general, though, he said he supports Trump’s decertification.

“President Trump made the right decision to decertify the Obama administration's Joint Comprehensive Plan of Action on Iran (JCPOA),” Rubio said. “He is correct in finding that this deal is not in our national interest.”

Rubio’s trepidation of the INARA changes highlights the difficulty Congress will have in passing changes to the deal, which would need 60 votes to pass in the Senate.

Democrats have said the changes being proposed amount to a unilateral rewriting of an international agreement, making their support unlikely.

Global allies have also signaled an unwillingness to renegotiate an already signed accord.

Trump has threatened to withdraw from the agreement entirely if Congress does not act.