John Bolton arrived at a federal courthouse Friday to surrender to authorities on charges accusing the former Trump administration national security adviser of storing top secret records at home and sharing with relatives diary-like notes that contained classified information.

Bolton did not comment to reporters as he entered the courthouse in Greenbelt, Maryland, where he is expected to make an initial appearance before a judge on the 18-count indictment brought against him on Thursday.

Authorities have suggested that classified information was exposed when operatives believed to be linked to the Iranian government hacked Bolton’s email account and gained access to sensitive material he had shared. A Bolton representative told the FBI in 2021 that his emails had been hacked, prosecutors say, but did not reveal that Bolton had shared classified information through the account or that the hackers had possession of government secrets.

The closely watched case centers on a longtime fixture in Republican foreign policy circles who became known for his hawkish views on American power and who served for more than a year in Trump’s first administration before being fired in 2019. He later published a book highly critical of Trump.

The third case against a Trump adversary in the past month will unfold against the backdrop of concerns that the Justice Department is pursuing the Republican president’s political enemies while at the same time sparing his allies from scrutiny.

“Now, I have become the latest target in weaponizing the Justice Department to charge those he deems to be his enemies with charges that were declined before or distort the facts,” Bolton said in a statement.