Republicans long suspicious of President Obama’s negotiations with Iran slammed a tentative accord the U.S. and world powers reached with the Islamic regime Thursday.

In fiery statements, Sens. Tom Cotton of Arkansas and Mark Kirk of Illinois dismissed Obama’s assurances that the deal would prevent Iran from developing nuclear weapons. They said the U.S. made too many unnecessary concessions, particularly because the agreement does nothing to roll back Iran’s role as the world’s most active state sponsor of terrorism and the fact that Tehran continues to threaten the national security of America and its allies in the Middle East, especially Israel.