"Based on the meeting with the President, the Department of Justice has asked the Inspector General to 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," Sanders said.
The sit-down had been scheduled last week.
But the session came less than 24 hours after the Justice Department asked its Office of the Inspector General to investigate whether there were improprieties in the use of an alleged FBI source who provided authorities with information about several Trump campaign operatives.
Trump called for the Justice Department to investigate agency officials amid a blistering series of tweets on Sunday morning.
He said he wanted Justice to "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!"
After the president's tirade, Justice Department spokeswoman Sarah Isgur Flores said, "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."
"As always, the Inspector General will consult with the appropriate U.S. Attorney if there is any evidence of potential criminal conduct."
FISA refers to "Foreign Intelligence Surveillance Act." The FBI obtained a warrant from a federal judge on the FISA court to surveil Carter Page, a former Trump campaign adviser, in 2016.
Rosenstein said Sunday, "If anyone did infiltrate or surveil participants in a presidential campaign for inappropriate purposes, we need to know about it and take appropriate action."
Trump has been angry since last year about an ongoing probe into his campaign by special counsel Robert Mueller, who is also investigating Russian interference in the 2016 election.
The president has repeatedly called that investigation a "witch hunt." And he has suggested that the FBI had improperly surveilled his campaign while letting his opponent, Hillary Clinton, off of the hook for a probe related to her use of a private email server while secretary of State.
Trump's ire on Sunday seems to have been ignited by a New York Times article on Saturday that revealed the president's son, Donald Trump Jr., three months before the election had met with an emissary for two rich Arab princes, an Israeli social media expert and a Republican, who were offering to help the Trump campaign.