President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Wednesday lashed out at House Democrats for calling former White House communications director Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE to testify.

In a string of tweets, the president accused congressional investigators of holding him and his team to a double standard by ignoring what he called the “real Obstruction” carried out by 2016 Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE.

“This is extreme Presidential Harassment. They gave Crooked Hillary’s people complete Immunity, yet now they bring back Hope Hicks,” Trump tweeted, accusing Democrats of wanting a "redo" of special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s Russia investigation.

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“DEMOCRAT CONGRESSIONAL HEARINGS ARE #RIGGED!” the president tweeted.

Hicks is testifying behind closed doors to the House Judiciary Committee, the first time a Trump White House adviser has appeared before the panel to answer questions as part of its investigation into whether the president obstructed the Russia probe.

But the hearing could turn contentious over the White House’s attempt to block Hicks from testifying about her time in the West Wing. White House counsel Pat Cipollone wrote in a letter to Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) that Hicks is immune from being compelled to speak about events at the White House.

Hicks was one of Trump’s closest advisers, having been an original aide on his 2016 campaign, before she left the White House last year.

She was a key witness for Mueller, offering information about major moments including Trump’s role in crafting a misleading statement about the Trump Tower meeting in 2016 during which Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE was expected to receive dirt on Clinton from a Kremlin-linked lawyer.