Sen. Tim Cotton said he and Sen. Bob Corker plan to introduce a bill that will "address the major flaws in the original Iran deal."
The Nobel committee praised ICAN for drawing attention to the "catastrophic humanitarian consequences" of using nuclear arms.
Investigators still haven't determined a clear motive for the attack, which left 58 people dead and hundreds injured.
Officials say 12 of the firearms found in the gunman's Mandalay Bay hotel room were equipped with what's called a bump stock or a bump-fire stock.
But, as of early Tuesday, authorities hadn't disclosed many details about the weapons the gunman used during the attack.
The United Nations Security Council voted Monday to impose a fresh round of sanctions on North Korea over its latest nuclear test.
President Trump issued an executive order undoing an Obama-era directive that limited police access to surplus military gear.
The U.S. is imposing new sanctions on Chinese and Russian companies and on individuals accused of helping North Korea.
The Trump administration is reportedly planning to recertify Iran's compliance with the historic deal that curbs its nuclear program.
During a press conference, U.S. President Donald Trump said he is considering some "pretty severe things" in response to North Korea's missile tests.
Police arrested 14 protesters in Portland, Oregon, for "criminal behavior."
Media reports say Israel blew up a weapons stockpile in Syria that was headed for Hezbollah, which makes an already tense relationship even worse.