US voter fraud

"I obviously have seen no evidence of illegal voting," McCain told CNN's Anderson Cooper. "My focus has been on national security, getting Gen. Mattis in as secretary of defense ... doing those issues."

McCain added that he had learned to disregard at least some of the President's newsmaking remarks and focus on the business of governing.

A 12-second video making the rounds on social media Tuesday appears to show a voter repeatedly touching a voting machine screen to select Donald Trump, while a red light stays on in the column for Hillary Clinton.

But even as some people claim it's clear evidence of vote rigging in Pennsylvania, the man who originally posted the video says that's not what he's saying.

The video has been shared tens of thousands of times on social media.