WASHINGTON ― Former National Security AdviserJohn Boltonis back to criticizingPresident Donald Trumpfollowing last week'sFBI search of his home and office. Bolton, speaking out for the first time since the FBI conducted its searches, penned an Aug. 25 op-ed inthe Washington Examinerthat referenced the FBI investigation as the former Trump aide resumed criticizing Trump's foreign policy on Ukraine. "Donald Trump's Ukraine policy today is no more coherent than it was last Friday when his administration executed search warrants against my home and office,"Bolton wrote, repeating thesame line in a post X. "Collapsing in confusion and haste, Trump's negotiations may be in their last throes, along with his Nobel Peace Prize campaign." The focus of the FBI's Aug. 22 searches targeting Bolton wasn't clear,but Vice President JD Vance saidit involved "classified documents." Democrats have slammed the Justice Department's investigation of Boltonas a politically motivated attackagainst a Trump adversary. During Turmp's first term, the Justice Department started a criminal investigation and filed a federal lawsuit that sought to block publication of Bolton's book, "The Room Where It Happened: A White House Memoir." More:Who is John Bolton? Ex-Trump adviser had house raided by FBI More:Trump calls former aide John Bolton a 'lowlife,' but doesn't know about FBI search Bolton, who also served asU.S. ambassador to the United Nations, has been a regular critic of Trump since serving for him in his first term. Trump has previouslycanceled Bolton's security clearanceandsecurity detail, despite anIranian assassination plot. "I'm not a fan of John Bolton," Trump told reporters last week after the FBI executed its searches of Bolton's Bethesda, Maryland home and Washington D.C. office. "He's a real sort of a lowlife." Contributing: Bart Jansen of USA TODAY This article originally appeared on USA TODAY:John Bolton rips Donald Trump days after FBI search of home and office