Donald Trump Rubio's a Sweat Hog ... Not Presidential Material

Marco Rubio cannot negotiate with Vladimir Putin, because he's way too sweaty ... so says Donald Trump.

Trump went on CNN after Thursday night's Republican debate and said it really doesn't matter why Rubio sweats ... it's a sign of weakness if the leader of the free world has sweaty pits when he goes head-to-head with world adversaries.

Trump's been on the campaign trail calling Rubio out as a "choke artist," noting that during the February debate, "He was soaking wet, I'm telling you. He was wet. I thought he just came out of a swimming pool."