President Donald Trump slammed his former national security adviser John Bolton, calling him "a lowlife" and "not a smart guy" but insisted he knows "nothing about" the FBI raids Friday morning of Bolton's home and office.

"I know nothing about it. I just saw it this morning," Trump told reporters during an unscheduled visit to the White House Historical Association.

The president said he expected to be briefed later in the day about the search of Bolton’s home and office.

“I’m not a fan of John Bolton. He’s a real, sort of, a lowlife,” he said.

“He is a, not a smart guy. But he could be very a very unpatriotic guy. We’re going to find out," Trump added.

The FBI on Friday searched the Maryland home and Washington office of former Trump administration national security adviser John Bolton as part of a criminal investigation into the potential mishandling of classified information, a person familiar with the matter said.

Bolton emerged as an outspoken critic of President Donald Trump after being fired in 2019 and feuded with the first Trump administration over a scathing book he wrote documenting his time in the White House.

He was not in custody Friday and has not been charged with any crimes, said the person, who was not authorized to discuss the investigation by name and spoke to The Associated Press on the condition of anonymity.