Former McCain aide Steve Schmidt: Trump's 'impairment is chilling'

Sen. John McCainJohn Sidney McCainDem gains put Sunbelt in play for 2020 Trump set to have close ally Graham in powerful chairmanship Cindy McCain takes aim at Trump: We need a strong leader, 'not a negative Nancy' MORE's (R-Ariz.) former presidential campaign manager, Steve Schmidt, said early Thursday that President TrumpDonald John TrumpBroward County official Brenda Snipes submits resignation after criticism Retired lieutenant general tears into Trump over attacks against Navy SEAL: 'Disgusting' Senate barrels toward showdown over Trump's court picks MORE was "clearly slurring his words" during an announcement that the U.S. will recognize Jerusalem as the Israeli capital, adding that "the impairment is chilling."

"I don’t know the cause of it, but when you combine it with [Sen.] Bob CorkerRobert (Bob) Phillips CorkerCorker: 'Everything points' to Saudi crown prince ordering Khashoggi's killing CIA concludes Saudi crown prince ordered Khashoggi murder: report  McConnell, Flake clash over protecting Mueller probe MORE’s critique that the president of the United States is unstable, that he’s dangerous, when you look at the private comments that are made by members of Congress around his stability, you look at his actions in recent weeks," said Schmidt, who is also an MSNBC contributor, on MSNBC's "Morning Joe."

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"The question of his fitness, of his stability, is in the air," Schmidt later added. "And it doesn’t get better when you see clear impairments."

Trump on Wednesday announced the U.S. will recognize Jerusalem as its capital and will move the U.S. Embassy there from Tel Aviv, keeping a campaign promise made in 2016.

The president appeared to have an issue with his speech toward the end of the announcement. Some in the media and many on social media speculated that he wears dentures and they were falling out, affecting his speech.

"#DentureDonald" was trending on Twitter for most of Wednesday into Thursday.

A White House spokesman, however, attributed Trump's slurred speech to "dry throat."

"I don’t know. Is that a tooth problem? Is that something else?" Schmidt asked on Thursday. "Presidents every year typically go to the Bethesda naval hospital for a checkup. This president, to my knowledge, is departing from that. We don't have updates on his health. We don’t know what’s going on, but this is a legitimate issue worthy of consideration. This is the man who commands America’s nuclear arsenal. And that video, that speech, that impairment, is chilling."

"Morning Joe" co-host Joe Scarborough has questioned Trump's mental fitness on several occasions in the past, with the former GOP congressman most recently stating on Nov. 30 that “people close to him during the campaign" told him "he had early stages of dementia."

Trump has not appeared on the MSNBC morning program or the network in any capacity since May 2016.

This report was updated at 9:40 a.m.