At the last GOP debate two weeks ago, Republican presidential candidate Marco Rubio predicted Russia's move into Syria to prop up President Bashar al-Assad.

On "The Kelly File" tonight, Rubio explained that it had been previously reported that Russia was positioning air assets in Syria. He said it was clear why, and it wasn't to go after the Islamic State.

"They may conduct some operations against ISIS, but this is not about ISIS," Rubio said. "This is about propping up Assad, who is a client state of both Iran and Vladimir Putin."

Rubio explained that the purpose of the airstrikes is to position Russia as the most important outside power broker in the region, replacing the U.S.

Rubio added that choosing Assad over ISIS, as Donald Trump seemed to suggest on "The O'Reilly Factor" last night, is a terrible idea.

"I don’t think the choice should be Assad or ISIS. I think they both need to go."

Watch more from Rubio above.

You might also be interested in...

Kim Davis: 'If I Resign, I Lose My Voice'

Megyn Kelly to Kim Davis: Your Critics Ask, 'Who Are You to Judge Others?'

Gutfeld to Black Lives Matter: 'Why Should Whites Talk to You If You Think Whites Are All Bad?'

Carly Fiorina: 'Black Lives Have Been Diminished Under Democratic Policies'