"All the talk, including the newscasts, are dominated by this plan that’s never going to happen," Rubio told ABC News' George Stephanopoulos on "Good Morning America" this morning.
"We need to refocus here on the important issue of terrorism," he said. "This is a growing threat and we’re not spending nearly enough time focusing on it."
He added that he believes Trump is not going to be the Republican nominee for the 2016 presidential election.
"We need to nominate someone who actually has a chance to win in the general election," he said. "I'm not going to hyperventilate about polls."
Rubio also bashed Democratic presidential frontrunner Hillary Clinton as having "no credibility" on foreign policy, calling for increased airstrikes and an intensified fight against ISIS.
"You cannot defeat ISIS just by airstrikes," he said.