Several hashtags and phrases relating to former 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 testimony, including #MuellerHearings, #MuellerTime, #MuellerTestifies and #MuellerDay all trended on Twitter in the hour leading up to the hearing on Tuesday.

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More than 12,000 people and institutions tweeted the #MuellerHearings hashtag, including Rep. Ted Lieu Ted W. LieuThe spin on Woodward's tapes reveals the hypocrisy of Democrats Larry Kudlow defends response to coronavirus: Trump 'led wisely' Lieu on Trump 'playing it down' on coronavirus: 'This is reckless homicide' MORE (D-Calif.), comedian Dean Obeidallah and CNN contributor Steve Cortes, a member of 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’s Hispanic Advisory Council.

Dear @realDonaldTrump: Perhaps you didn't read the Mueller report or don't understand the crime of Obstruction of Justice. You should watch the #MuellerHearings. Starts at 8:30 am ET / 5:30 am PT this morning. https://t.co/Qmq7OoeSl5 — Ted Lieu (@tedlieu) July 24, 2019

Trump is so panicked he now asks Why didn't Robert Mueller investigate himself?! Trump is truly freaking out this AM - it brings me such joy. Anyone else?! #MuellerHearings — (((DeanObeidallah))) (@DeanObeidallah) July 24, 2019

The Trump campaign never coordinated or conspired. More broadly, Mueller found that NO American assisted the Russian efforts. #MuellerHearings pic.twitter.com/q1kv0OWQ28 — Steve Cortes (@CortesSteve) July 24, 2019

Mueller’s testimony is set to begin at 8:30 a.m. Wednesday before the House Judiciary Committee, with an additional round before the House Intelligence Committee at noon.