“This agreement will not ‘freeze’ Iran’s nuclear program and won’t require the regime to suspend all enrichment as required by multiple UN Security Council resolutions,” Sen. Marco Rubio (R-Fla.) said in a statement. “By allowing the Iranian regime to retain a sizable nuclear infrastructure, this agreement makes a nuclear Iran more likely. There is now an even more urgent need for Congress to increase sanctions until Iran completely abandons its enrichment and reprocessing capabilities.”

Rubio is part of a bipartisan group of senators who sought to toughen sanctions on Iran ahead of Saturday’s announcement. Senior Obama administration officials, including Secretary of State John Kerry, pressed senators in recent weeks to hold off on additional sanctions as negotiations with Iran progressed.

House Armed Services Committee Chairman Buck McKeon (R-Calif.) compared the deal to the 1994 agreement with North Korea to disarm their nuclear program — a pact that ultimately broke down.

“Iran hasn’t given the world reason to be anything but deeply skeptical of any agreement that leaves their capacity to build nuclear weapons intact,” McKeon said in a statement. “The president sees wisdom in placing trust, however limited, in a regime that has repeatedly violated international norms and put America’s security at risk. Apparently, America has not learned its lesson from 1994 when North Korea fooled the world. I am skeptical that this agreement will end differently.”