(JNS) A group of 49 Republican senators wrote to President Joe Biden that it would not support a new nuclear deal with Iran and vowed to “reverse” any agreement that weakens sanctions or restrictions against the Islamic Republic.

Every Republican senator except Sen. Rand Paul (R-Ky.) signed the letter, warning that “a major agreement that does not have strong bipartisan support in Congress will not survive.”

“According to press reports, the Biden administration may soon conclude an agreement with Iran to provide substantial sanctions relief in exchange for merely short-term limitations on Iran’s nuclear program,” wrote the Republican senators.

The senators added that the Biden administration “appears to have agreed to lift sanctions that were not even placed on Iran for its nuclear activities in the first place, but instead because of its ongoing support for terrorism and its gross abuses of human rights.

“The nuclear limitations in this new deal appear to be significantly less restrictive than the 2015 nuclear deal … and will sharply undermine U.S. leverage to secure an actually ‘longer and stronger’ deal,” they said. “What is more, the deal appears likely to deepen Iran’s financial and security relationship with Moscow and Beijing, including through arms sales.”

While no Democrats signed onto the letter, some such as Sen. Bob Menendez (D-N.J.), who heads the powerful Foreign Affairs Committee, have expressed serious reservations about any nuclear deal.

The Republican senators said they support an Iran policy that “completely blocks Iran’s path to a nuclear-weapons capability, constrains Iran’s ballistic-missile program and confronts Iran’s support for terrorism.”