John Bolton, a former national security adviser to Donald Trump who became a staunch critic, pleaded guilty to mishandling classified information on Friday.

Bolton had faced 18 counts of unlawful transmission and retention of national defense information for allegedly sharing notes with his wife and daughter — some of which contained information classified as high as “Top Secret” — during his time serving in the first Trump administration.

In court Friday, Bolton confessed and pleaded guilty to just one of the 18 counts he was originally charged with: the retention of national defense information.

“Today, Ambassador Bolton did what real leaders do. He took responsibility for a mistake he made, thereby saving the government resources to pursue a case that could expose additional sensitive information,” Bolton’s lawyer Abbe Lowell said.

Under the plea agreement, Bolton could serve up to five years in federal prison and would have to pay a fine of $2.25 million, half of which would have to be paid within five days of his sentencing. He will also forgo any retirement benefits related to his work with the government, for himself or his family, according to NPR.