The Yale psychiatrist who last month warned lawmakers on Capitol Hill about what she sees as the threat posed by President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE said she has received thousands of death threats, most of them on Twitter.

"I was concerned because I was getting a thousand threatening messages a day at one point," Dr. Bandy Lee told the New Haven Register on Sunday.

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Politico reported earlier this month that Lee met with lawmakers on Dec. 5 and Dec. 6 to brief them on Trump's mental state.

An assistant clinical professor who edited a collection of psychiatric testimonials called "The Dangerous Case of Donald Trump," Lee reportedly warned the lawmakers that Trump is "going to unravel."

“We feel that the rush of tweeting is an indication of his falling apart under stress. Trump is going to get worse and will become uncontainable with the pressures of the presidency," Lee later told Politico.

Her meeting drew criticism from some, who claimed she was in violation of some ethics codes by evaluating Trump's mental health without having actually met him.

Lee denied those charges to the Register.

Reports of Lee's meeting with lawmakers came amid mounting concern over Trump's mental health. Earlier this month, a reporter asked White House press secretary Sarah Huckabee Sanders if the public should be "concerned about the president’s mental fitness."

The White House has dismissed such concerns.