Rep. Maxine Waters Maxine Moore WatersPelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book Business groups increasingly worried about death of filibuster MORE (D-Calif.) on Wednesday offered a message of encouragement to 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, telling him to "stay strong and stand tall" while conducting the probe into alleged ties between the Trump campaign and Russia.

"A message to Mueller: Stay strong and stand tall. Continue to investigate them all. You are indeed answering the people's call. The Kremlin Klan is going to fall," Waters tweeted.

"Around you the Democrats are building a wall. We look forward to the day, to prison they will all be hauled."

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A message to Mueller: Stay strong and stand tall. Continue to investigate them all. You are indeed answering the people's call. The Kremlin Klan is going to fall. Around you the Democrats are building a wall. We look forward to the day, to prison they will all be hauled. — Maxine Waters (@RepMaxineWaters) January 3, 2018

Waters's comments come as Mueller's probe faces increased criticism from Republicans skeptical of the investigation.

House Republicans last month seized upon leaked text messages critical of President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE sent between FBI employees Peter Stzrok and Lisa Page. Critics argued the texts were evidence of anti-Trump bias on the Mueller team.

Strzok was reassigned from the Mueller probe after the messages were revealed.

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Waters's tweet also came the same day Manafort sued Mueller and the Department of Justice on the grounds that the probe "is overly broad and not permitted under Justice Department regulations."

Trump said in an interview last month that he believed Mueller would treat him fairly.

The probe has led to the indictments of former Trump campaign chairman Paul Manafort Paul John ManafortBannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention Ukraine language in GOP platform underscores Trump tensions MORE and his business associate Richard Gates.

Trump's former national security adviser Michael Flynn and campaign foreign policy adviser George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE have pleaded guilty as part of the probe.