'Manic, unhinged and unnerving': MSNBC's host warns that Trump's erratic behavior has 'crossed the threshold'

MSNBC guest host John Heilemann warned on Thursday that President Donald Trump's behavior has been "manic, unhinged, and unnerving" in recent days — and some fear it will only get worse.

Heilemann was filling in for Nicolle Wallace on "Deadline: White House."

He noted at the top of the show that Trump's behavior has driven a consensus this week that he's even less even-keeled than usual — which is saying a lot.

"The world is reeling and offering a collective judgment of O-M-G and W-T-F," Heilmann said. He then played a clip of Trump's bizarre, belligerent, and blatantly racist comments. He claimed that "no one can be trusted," that Jews who vote for Democrats are "disloyal," and that he is "the Chosen One."

"This string of absurdities might seem mildly funny at times, but to Trump's own former aides, what they witnessed in recent days has crossed the threshold from amusing to alarming," he said.

Watch the clip below: