John Bolton, who served as national security adviser to U.S. President Donald Trump during his first term and later became a vocal critic of the Republican leader, was seen leaving his home in Maryland on Friday after being charged with storing top secret records.

Bolton was also charged Thursday with sharing diary-like notes with relatives about his time in government that contained classified information.

The 18-count indictment also suggests classified information was exposed when operatives believed to be linked to the Iranian regime hacked Bolton’s email account and gained access to sensitive material he had shared.

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

Bolton foreshadowed that argument in a defiant statement Thursday in which he denied the charges and called them part of an “intensive effort” by Trump to “intimidate his opponents.”