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 Sunday night accused Democrats of "Presidential Harassment" and again attacked the media, as scrutiny over his presidency reaches a fever pitch on Capitol Hill.

"Presidential Harassment by 'crazed' Democrats at the highest level in the history of our Country," Trump wrote in a series of tweets. "Likewise, the most vicious and corrupt Mainstream Media that any president has ever had to endure - Yet the most successful first two years for any President. We are WINNING big, the envy of the WORLD, but just think what it could be?"

Presidential Harassment by “crazed” Democrats at the highest level in the history of our Country. Likewise, the most vicious and corrupt Mainstream Media that any president has ever had to endure - Yet the most successful first two years for any — Donald J. Trump (@realDonaldTrump) March 3, 2019

....President. We are WINNING big, the envy of the WORLD, but just think what it could be? — Donald J. Trump (@realDonaldTrump) March 3, 2019

Trump has repeatedly assailed Democrats and journalists throughout his time in the White House, but Sunday's tweets come as Democratic lawmakers — who took back the House in the 2018 midterm elections — are stepping up their investigations into both his 2016 campaign and his conduct as president.

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Top Democrats on Sunday suggested there is already substantial evidence that the Trump campaign colluded with Russia and that the president engaged in obstruction of justice.

House Judiciary Committee Chairman Jerrold Nadler (D-N.Y.) said on ABC's "This Week" that his panel had requested documents from more than 60 people tied to the administration and would continue probes into possible abuses of power carried out by Trump.

Rep. Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.), who heads the House Intelligence Committee, said on CBS's "Face the Nation" there is already "direct evidence" the Trump campaign colluded with Russia, and that his panel would look for more evidence into whether the president engaged in a criminal conspiracy.

Their comments come days after Trump's onetime personal attorney, Michael Cohen, testified before the House Oversight and Reform Committee, where he accused the president of lying to the public about hush money payments and floated the possibility of collusion with Moscow.

Cohen's testimony raised chatter about impeachment proceedings against Trump, but Nadler and other top Democrats, including Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (Calif.), have been quick to tamp down such talk.

"Impeachment is a long way down the road," Nadler said, while pushing back against the idea that he was leading an "impeachment investigation."