'I've never seen anything like it': Morning Joe panel disgusted by Trump mocking Clinton's pneumonia

On Monday’s edition of Morning Joe, co-host Joe Scarborough said that Republican presidential nominee Donald Trump’s snide, deeply personal insults toward his opponent Hillary Clinton are unlike anything he’s ever seen in U.S. politics.

Morning Joe's panel began by watching some highlights of Trump's latest anti-Clinton speech in Pennsylvania this weekend -- where he mocked her for coming down with pneumonia and suggested that she wasn't loyal to her husband -- and came away thoroughly disgusted with his behavior.

"Mocking her health scare, talking about his temperament, and then moving on to speculating about her personal life in a way that's just so over-the-top," co-host Joe Scarborough said when summing up Trump's Saturday speech. "I've never seen anything like it."

Nicole Wallace, a Republican and former official in George W. Bush's administration, said that any normal person watching Trump's antics will likely be far more revolted by them than at any revelations about his tax returns.

"This is the stuff that, at the gut level, people are rejecting," she said. "And this is the stuff that, if I were running against him, I would want to make sure everybody saw. These are the traits that reinforce her core message, which is that he's temperamentally unfit to be president."

Mark Halperin shared Wallace's assessment and noted that ever since losing the debate last Monday, Trump has done nothing except give the Clinton campaign "more and more material" to prove that he lacks the temperament to be president.

"It's as if [Clinton campaign manager] Robby Mook calls him every morning and says, 'Here's what I need you to do to reinforce the notion that you don't have the right temperament to be president,'" he said.

Check out the full clip below.