Rubio: Trump not a true conservative
© Greg Nash

Republican presidential candidate Marco RubioMarco RubioOvernight Defense: Commander calls North Korea crisis 'worst' he's seen | Trump signs VA order | Dems push Trump to fill national security posts What’s with Trump’s spelling mistakes? Boeing must be stopped from doing business with Iran MORE said that rival Donald TrumpDonald TrumpWHCA dinner could be Trump's chance to one-up the media. He should take it. Trump promises border wall still coming at NRA summit Perez: Trump and Republican in Georgia runoff are '2 peas in a pod' MORE is not a true conservative, criticizing the front-runner for not attending the Conservative Political Action Conference.

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"This is the American Conservative Union, and so, I mean, it's usually reserved for conservatives," the Florida senator said on CNN's "State of the Union" Sunday morning.

"This matters. Either the ideas behind conservatism matter or they do not. And if they do not, then it's fine, but I believe they do."

Rubio said candidates can't just ask for votes because they're "angrier."

"It is not enough to say vote for me because I am angrier and over-the-top and I'm going to do and say things no one else is going to do," Rubio said.

"I get that anger and frustration, I really do," he added.

Rubio continued to name many young conservative leaders in the country — calling out Trump for not having the same values and saying they grew up during the time of former President Ronald Reagan.

"And Ronald Reagan looked and acted nothing like Donald Trump," he said.