“Joe Biden, as Barack Obama’s own secretary of defense has said, has been wrong about nearly every foreign policy and national security decision in the last 40 years,” Cotton said on MSNBC's "Morning Joe."
Following the release of the letter, in which the Republicans told the Iranians that any nuclear deal reached with the Obama administration could be overridden, Biden released a harsh statement.
"This letter sends a highly misleading signal to friend and foe alike that that our Commander-in-Chief cannot deliver on America’s commitments—a message that is as false as it is dangerous," it read.
The vice president also said that the move was "beneath the dignity of an institution I revere."
Cotton turned Biden's words against him on "Morning Joe."
"If Joe Biden respects the dignity of the institution of the Senate, he should be insisting that the President submit any deal to approval of the Senate, which is exactly what he did on numerous deals during his time in Senate,” he added.
When Cotton's interviewers asked him for an alternative approach to the Obama administration's negotiation, he called for “complete nuclear disarmament by Iran.”
Cotton added at one point that he supported the letter to the foreign nation because Iran's leaders "don’t understand our Constitution."
Watch the interview, courtesy of MSNBC: