Vice President Joe Biden came out swinging in a strongly-worded statement late on Monday regarding the preemptive strike of 47 Republican senators against a potential nuclear deal with Iran.

The GOP lawmakers all signed onto a letter released Monday saying their would reject any diplomatic agreement reached between the Obama administration and Iran’s supreme leader, Ayatollah Ali Khamenei. “The next president could revoke such an executive agreement with the stroke of a pen and future Congresses could modify the terms of the agreement at any time,” they wrote.

Biden, who prior to getting elected vice president served over three decades in the Senate, said he was deeply offended by the stance some of his former colleagues took. “The letter sent onhttp://www.msnbc.com/msnbc/joe-biden-gop-senators-iran-letter-offends-me March 9th by forty-seven Republican Senators to the Islamic Republic of Iran, expressly designed to undercut a sitting president in the midst of sensitive international negotiations, is beneath the dignity of an institution I revere,” he said in a statement late on Monday.

The vice president’s statement echoed similar sentiments expressed by White House Press Secretary Josh Earnest during a press briefing on Monday. He described the letter “as the continuation of a partisan strategy to undermine the president’s ability to conduct foreign policy and advance our national security interests around the globe.