President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Monday attacked three of his potential Democratic challengers in the 2020 presidential election, criticizing at a Tennessee rally Democratic Sens. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (Mass.) and Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (N.J.), as well as former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE.

Trump, who was visiting Johnson City to support the Senate bid of Rep. Marsha Blackburn Marsha BlackburnTaylor Swift on National Voter Registration Day: 'We need everyone' Democrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (R-Tenn.), attacked Booker first, saying the former mayor "destroyed" the city of Newark, N.J.

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"And see some of the things he wrote when he was young about women," Trump added, apparently referencing Booker's admission in a 1992 column while he was at Stanford University that he groped a classmate in high school.

Trump then said that Democrats "have moved so far left that Pocahontas is considered a conservative." Trump has often referred to Warren as "Pocahontas" as a criticism of her claims that she has Native American ancestry.

"Elizabeth Warren. She said she’s considering a run for the presidency. Please, please run,” Trump added, his hands pressed together as if in prayer.

Trump then turned to Biden, sarcastically calling him a "real genius" and referencing comments that Biden has made suggesting that he would have fought Trump if they had gone to high school together.

" ‘I want to challenge him to a fight behind the barn.’ Oh, I’d love that. Wouldn’t that be good?" Trump said. "He’s another beauty. They’ve got some real beauties.”

Biden said in March that he would have "beat the hell out" of Trump had they gone to high school together, referring to the "Access Hollywood" tape that surfaced during the 2016 presidential election in which Trump can be heard bragging about groping and kissing women without their consent.

Trump on Monday urged those at the rally to vote for Republicans in November's midterm elections.

“Democrats want activists, left-wing judges who will totally rewrite your laws, erase your borders and replace your values," Trump said. "You don’t want that in Tennessee. Republicans know that a judge’s job is to follow the law and deliver equal justice for all.”