In an interview Wednesday morning with "Face to Face" host Jon Ralston, U.S. Sen. Harry Reid (D-Searchlight) refused to back down from comments he made last week to colleague U.S. Sen. Joe Lieberman (I-Conn.) that "I can't stand John McCain."

Instead, he ramped up his criticism of the Arizona U.S. senator and presumptive Republican presidential nominee.

"I've served with the man 26 years. Do I have the ability to speak with experience about someone who has abused everyone he's dealt with? Someone who does not have the temperament to be president, who's wrong on the war, wrong on the economy, wrong on nuclear waste," said Reid, adding, "What am I supposed to do? Walk around talking about what a great guy he is? I don't believe that."

Ralston pressed Reid on his latest comments. "When you say he doesn't have the temperament, that's just a very close step away from saying it's dangerous to let him become president."

"Well, if you said it, I wouldn't correct you," replied Reid.

He continued, "there isn't a Republican serving in the Senate that's happy he's the nominee. Now, they're all supporting him, but I'll tell you they have told me. I've had Republican senators tell me they don't think they'll vote for him."