Trump demands DOJ probe claims of campaign surveillance

President TrumpDonald John TrumpTrump pushes back on recent polling data, says internal numbers are 'strongest we've had so far' Illinois state lawmaker apologizes for photos depicting mock assassination of Trump Scaramucci assembling team of former Cabinet members to speak out against Trump MORE on Sunday said he’ll ask the Department of Justice (DOJ) to investigate whether the FBI surveilled his campaign.

“I hereby demand, and will do so officially tomorrow, that the Department of Justice look into whether or not the FBI/DOJ infiltrated or surveilled the Trump Campaign for Political Purposes - and if any such demands or requests were made by people within the Obama Administration!” Trump tweeted. 

Not long afterward, the DOJ announced it had asked its inspector general to expand its probe into alleged surveillance abuses to encompass the most recent claims.

“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 said in a statement on Sunday afternoon.

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."

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The New York Times reported Friday that an FBI informant met with two former Trump campaign advisers, George PapadopoulosGeorge Demetrios PapadopoulosFlynn, Papadopoulos to speak at event preparing 'social media warriors' for 'digital civil war' Judge dismisses DNC lawsuit against Trump campaign, Russia over election interference Mueller hearings should lead Democrats to be shocked at abuse of justice system MORE and Carter Page, after they'd received information that those two had contacts with Russia.

Trump's calls for an investigation into the matter come as House Republicans have pushed for access to documents that reveal the identity of the informant who gave investigators information about possible ties between the Trump campaign and Russia. 

The DOJ denied a request earlier this month from House Intelligence Committee Chairman Devin NunesDevin Gerald NunesJuan Williams: Trump, his allies and the betrayal of America Trump expected to nominate Texas GOP lawmaker to replace Dan Coats: report House Republicans claim victory after Mueller hearings MORE (R-Calif.) for details related to the source. The DOJ said that releasing such information would put lives at risk and endanger national security.

Despite those warnings, Trump has joined in the calls for the source to be revealed.

Democrats have also warned that doing so would jeopardize the source and national security, and could pose a legal risk. They have suggested claims the FBI spied on Trump's campaign are part of an effort to undermine special counsel Robert MuellerRobert (Bob) Swan MuellerTrump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony Kellyanne Conway: 'I'd like to know' if Mueller read his own report MORE's probe into Russian meddling in the 2016 election.

Trump has long blasted Mueller's probe as a "witch hunt" and a "hoax."

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

Updated: 7 p.m.