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 on Monday urged Department of Justice (DOJ) and FBI officials to "simply say no" to 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's demand for an expanded investigation into his claims of FBI wrongdoing as it relates to his campaign.

"More DOJ norms being eroded. Trump-a SUBJECT of the investigation-wants access to material related to the inquiry," Holder tweeted.

More DOJ norms being eroded. Trump-a SUBJECT of the investigation-wants access to material related to the inquiry. His Congressional supporters want evidence connected to an ongoing investigation. Time for DOJ/FBI to simply say no-protect the institutions and time tested norms. — Eric Holder (@EricHolder) May 21, 2018

Holder served as attorney general under former President Obama from 2009-2015. He has frequently criticized Trump and floated the possibility of a potential 2020 presidential campaign.

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His latest criticism of the president came as Trump and his allies have claimed, without evidence, that an FBI informant spied on his campaign for political purposes. On Sunday, Trump said he would demand the DOJ investigate the matter.

It is uncommon for a president to request specific investigations from the DOJ.

The president then met Monday with Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE and FBI Director Christopher Wray at the White House.

Trump agreed to a deal in which the DOJ inspector general would “expand its current investigation to include any irregularities with the Federal Bureau of Investigation’s or the Department of Justice’s tactics concerning the Trump Campaign,” White House press secretary Sarah Huckabee Sanders said in a statement.

Sanders also said chief of staff John Kelly John Francis KellyMORE plans to “immediately set up a meeting” between top law enforcement officials and lawmakers on Capitol Hill to “review” the “highly classified” materials that representatives have sought about the informant.

Republicans, led by House Intelligence Committee Chairman Devin Nunes Devin Gerald NunesSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Sunday shows preview: With less than two months to go, race for the White House heats up Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (Calif.), have in recent weeks sought access to documents that reveal the identify of the informant, even as intelligence officials have warned that doing so could threaten lives and national security.

Democrats have argued that Republican attacks on the FBI and Trump's calls for an internal probe are an effort 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 ongoing investigation into Russian meddling in the 2016 election.