The Department of Justice (DOJ) has asked its inspector general to look into whether the FBI surveilled 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 campaign for "inappropriate purposes."

“If anyone did infiltrate or surveil participants in a presidential campaign for inappropriate purposes, we need to know about it and take appropriate action," 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 said in a statement.

DOJ spokeswoman Sarah Isgur Flores said in a separate statement that "the Inspector General will consult with the appropriate U.S. Attorney if there is any evidence of potential criminal conduct."

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The expanded probe, she said, will "include determining whether there was any impropriety or political motivation in how the FBI conducted its counterintelligence investigation of persons suspected of involvement with the Russian agents who interfered in the 2016 presidential election."

The DOJ announcement comes just hours after Trump tweeted that he planned to demand on Monday that the department look into whether federal agents spied on his campaign for "political purposes."

The original probe into alleged FBI surveillance abuse was announced in late March, and was focused on whether the department abused the Foreign Intelligence Surveillance Act (FISA) when it obtained a warrant to surveil former Trump campaign associate Carter Page.

That investigation sprung from claims among some House Republicans that federal officials inappropriately used the so-called Steele dossier to obtain a warrant to surveil Page.

Trump has spent the last few days sounding the alarm on Twitter about claims that an FBI informant was embedded within his campaign. He has alleged, without evidence, that the FBI sought to spy on his campaign for political purposes, which Trump argued would be a scandal "bigger than Watergate."

The New York Times reported Friday that an FBI informant met with two former Trump campaign advisers, George Papadopoulos and Carter Page, after they'd received information that those two had contacts with Russia.

Republicans have in recent weeks sought access to documents that reveal the identify of the FBI's informant, even as intelligence officials have warned that doing so could threaten lives and national security.

The dispute over the informant is the latest clash between House Republicans and the FBI in recent months.

House Republicans, led by Rep. 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 (R-Calif.), published a memo in January that detailed alleged FISA abuses. They released the memo despite the FBI warning that doing so would be "extraordinarily reckless."

Democrats have argued that Republican attacks on the FBI and Trump's calls for an internal probe serve only 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.

Several Republicans have called for an end to Mueller's investigation, which the president has repeatedly deemed a "witch hunt."

Four former Trump associates and 13 Russian nationals have pleaded guilty or been indicted as part of the investigation thus far.