Washington Donald Trump drew boos from religious conservatives Friday after he called Marco Rubio a "clown" and attacked him on immigration.
"You know there's this clown Marco Rubio, I've been so nice to him," Trump said at the Family Research Council's Values Voter Summit in Washington, D.C.
"If there's a debate tomorrow, Donald Trump is still front and center," Trump executive vice president Michael Cohen told CNN's Alisyn Camerota on "New Day."
Trump and Rubio have been taking shots at each other this week, with the latest hit landing Thursday on Fox, where the Florida senator said Trump is "very thin-skinned, obviously.
Rubio has been gaining steadily in national polls, along with former Hewlett-Packard CEO Carly Fiorina, while Trump's lead has been slipping a bit since the second Republican debate.