FBI agents requested permission to search Trump's Florida home 

after reviewing 184 classified documents and interviewing "many civilian witnesses, court documents say.

Nearly three weeks after the Aug. 8 search, an affidavit and memo highlight the high stakes and unprecedented nature of a criminal probe

into whether Trump and his aides took secret government papers and refused to return all of the material.

If classified documents returned from Mar-a-Lago to the National Archives in January fell into the wrong hands,

they could have revealed intelligence sources or how spy agencies intercept foreign targets' electronic communications.

"There's also probable cause to suspect obstruction," the affidavit says.

Federal Magistrate Judge Bruce E. Reinhart read the affidavit and approved the search on Aug. 5.

Three days later, FBI agents in polos and khakis executed the search warrant at the Palm Beach estate,

carting away 20 boxes from a bedroom, office, and first-floor storage room, according to an inventory made public this month.

The search warrant said agents were looking for "physical documents and records constituting evidence, contraband, fruits of crime, or other illegally possessed items"