President Donald Trump has made no secret of his desire to see his critics investigated, pressuring the Justice Department to prosecute former FBI Director James Comey and New York Attorney General Letitia James.

"We can't delay any longer, it's killing our reputation and credibility," the president wrote last month in a Truth Social post.

"They impeached me twice, and indicted me (5 times!)" he said, referencing the four criminal cases he faced after leaving the White House in 2021 and James's civil case.

Both have since been charged, in cases that many experts have said appear to be politically motivated and difficult to win in court.

But the latest charges against a Trump critic, former national security adviser John Bolton, stand apart, legal specialists and former prosecutors say.