Presidential Records Act and Trump search explained

The FBI on Monday executed a search warrant at former President Trump's Mar-a-Lago residence in what one former federal prosecutor called the "most important search warrant in the history of the United States."

The big picture: The search appeared to mark a dramatic escalation in the investigation into Trump's handling of presidential documents.

Two sources familiar with Monday's investigation told Axios' Jonathan Swan that it was their understanding that the raid was related to documents Trump took from the White House that may have been classified.

It is unclear what specific evidence the FBI sought from Trump, who is entangled in numerous legal battles, including the Justice Department's investigation into efforts to overturn the 2020 presidential election.