Trump, the first speaker Friday morning at the Conservative Political Action Conference (CPAC), spoke to a half-full ballroom as the audience trickled in for the next speaker, Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSenate passes 0B defense bill Overnight Health Care: New GOP ObamaCare repeal bill gains momentum Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea MORE (R-Ky).

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Romney will be speaking at the conference later Friday. 

CPAC organizers have drawn some criticism for inviting Trump to speak while snubbing others like New Jersey Gov. Chris Christie (R). 

The audience didn't seem very excited about the "Apprentice" host, though he received a warm welcome and drew applause for saying the U.S. should have taken from Iraq's oil reserve to pay for the war there.

Trump also blasted current immigration reform plans, attacking the idea of giving the mostly Hispanic and Asian population of illegal immigrants a pathway to citizenship.

"When it comes to immigration, 11 million illegals will be voting Democratic. You could say you are looking at a suicide mission," Trump said to applause. "Why aren't we letting people in from Europe?"