President Donald Trump met Monday afternoon at the White House with Deputy Attorney General Rod Rosenstein and FBI Director Christopher Wray a day after he tweeted that he would "demand" the Justice Department investigate whether his 2016 presidential campaign was improperly "infiltrated or surveilled" for political purposes.

Beforehand, a senior administration official told ABC News the president's demand for an investigation into the alleged use of an FBI informant to contact Trump campaign associates would "absolutely" come up at the regularly scheduled meeting.

In his Sunday tweet, the president said he would make the order official on Monday but offered no further details about what form he would expect such an inquiry to take.

Trump added that he'd ask whether "any such demands or requests were made by people within the Obama Administration."

Jamie McCarthy/Getty Images

Getty Images

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

"The Department has asked the Inspector General to expand the ongoing review of the FISA application process to 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," Justice Department spokeswoman Sarah Isgur Flores said in a statement.

"As always the Inspector General will consult with the appropriate U.S. Attorney if there is any evidence of potential criminal conduct," Flores said.

The tweet is the latest escalation by the president in fueling an assertion that the Trump campaign may have been spied on by the Federal Bureau of Investigation or the DOJ. President Trump has sent out a series of tweets in recent days advancing the accusation first voiced by some conservative commentators that the FBI had a spy in the Trump campaign.