President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE in an early morning tweet on Monday thanked former Senate Majority Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.) for warning Democrats not to underestimate him in 2020.

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“Former Democrat Senator Harry Reid just stated that Donald Trump is very smart, much more popular than people think, is underestimated, and will be hard to beat in the 2020 Election,” Trump tweeted.

“Thank you Harry, I agree!”

Former Democrat Senator Harry Reid just stated that Donald Trump is very smart, much more popular than people think, is underestimated, and will be hard to beat in the 2020 Election. Thank you Harry, I agree! — Donald J. Trump (@realDonaldTrump) October 14, 2019

Reid told CNN’s David Axelrod David AxelrodThe Memo: Warning signs flash for Trump on debates GOP hunts for leverage in revived COVID-19 talks Pelosi says there shouldn't be any debates between Biden and Trump MORE during an interview on “The Axe Files” aired over the weekend that he used to think that Trump was “not too smart.”

“I certainly don't believe that anymore,” he said.

The Nevada Democrat added that he doesn’t think Trump is “intellectually a powerhouse, but he is basically a very, very smart man.”

“No matter what the subject, any argument he involves himself in, it's on his terms. You're always arguing against him. He never, never is willing to debate an issue on terms that aren’t his,” he said.

When asked what advice he would give to a candidate running against Trump, Reid responded, “Well, what I say initially, and I say it right here in your show, anyone that thinks Trump's going to be beaten easily should have another think coming.”