Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE (D) urged officials at the Department of Justice (DOJ) and the FBI to "be strong" in the face of attacks.

"I said about 8 months ago that the actions and integrity of the men & women at DOJ/FBI would be unfairly questioned. It’s happening," Holder tweeted Sunday.

"And it will get worse. Be prepared, be strong. You have the support of millions committed to truth, justice and the defense of this nation."

I said about 8 months ago that the actions and integrity of the men & women at DOJ/FBI would be unfairly questioned. It’s happening. And it will get worse. Be prepared, be strong. You have the support of millions committed to truth, justice and the defense of this nation — Eric Holder (@EricHolder) March 18, 2018

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His comments come after Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE on Friday fired FBI Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE, after an internal FBI office found that McCabe wasn't forthcoming during a review by the Justice Department's inspector general.

McCabe defended himself after his firing, calling his dismissal an attempt to undermine 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 probe into Russia's election interference and possible ties between the Trump campaign and Russia.

President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE then sent out a series of tweets attacking McCabe, his former boss and former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE and Robert Mueller, the special counsel in charge of the investigation into Russian interference. He also said McCabe's firing proved "there was tremendous leaking, lying and corruption at the highest levels of the FBI, Justice & State."

McCabe had long been on the receiving end of criticism from congressional Republicans and Trump. Trump touted his firing early Saturday, calling it a "great day for democracy."

On Saturday, Trump reiterated his claim that there was no collusion between his campaign and Russia.

He said the Mueller probe should "never have been started in that there was no collusion and there was no crime."

Holder on Saturday ripped the Trump administration for firing McCabe, calling the timing of the dismissal "cruel."