JOHN BOLTON, WHOSE HOME AND OFFICE WERE SEARCHED BY FEDERAL AGENTS ON FRIDAY, HAS BEEN ONE OF THE MOST VOCAL CRITICS OF PRESIDENT DONALD TRUMP SINCE HE SERVED AS A NATIONAL SECURITY ADVISER IN TRUMP'S FIRST ADMINISTRATION.

THE FBI SEARCHED HIS MARYLAND HOME AND WASHINGTON OFFICE AS PART OF A CRIMINAL INVESTIGATION INTO THE POTENTIAL MISHANDLING OF CLASSIFIED INFORMATION, A PERSON FAMILIAR WITH THE MATTER SAID.

BOLTON SERVED AS TRUMP’S THIRD NATIONAL SECURITY ADVISER FOR 17 MONTHS AND CLASHED WITH HIM OVER IRAN, AFGHANISTAN AND NORTH KOREA.

AFTER BEING FIRED IN 2019, BOLTON EMERGED AS AN OUTSPOKEN CRITIC OF PRESIDENT TRUMP, WRITING A BOOK CALLED "THE ROOM WHERE IT HAPPENED.”

IT PORTRAYED TRUMP AS GROSSLY ILL-INFORMED ABOUT FOREIGN POLICY.

TRUMP RESPONDED BY SLAMMING BOLTON AS A “CRAZY” WAR-MONGER WHO WOULD HAVE LED THE COUNTRY INTO “WORLD WAR SIX.”

ON HIS FIRST DAY BACK IN OFFICE THIS YEAR, TRUMP REVOKED THE SECURITY CLEARANCES OF MORE THAN FOUR DOZEN FORMER INTELLIGENCE OFFICIALS, INCLUDING BOLTON.

ON FRIDAY, TRUMP CRITICIZED BOLTON AGAIN CALLING HIM A “LOWLIFE” AND SAYING HE WAS “NOT A FAN.”

SOUNDBITE (English) Donald Trump, US President:

"When I hired him, he served a good purpose because, as you know, he was one of the people that forced Bush to do the ridiculous bombings in the Middle East. Bolton... He wants to always kill people."

BOLTON HAD SAID IN PAST INTERVIEWS THAT HE WAS MINDFUL THAT HE COULD SCRUTINIZED, TELLING THE AP IN JANUARY SHORTLY BEFORE TRUMP TOOK OFFICE, “ANYBODY WHO EVER DISAGREES WITH TRUMP HAS TO WORRY ABOUT RETRIBUTION."