In 2005, he was mobilized to active duty to serve as Deputy Legal Counsel to the Chairman of the Joint Chiefs of Staff.

[citation needed] Williams worked as a federal prosecutor, and served on the Joint Terrorism Task Force.

Craig Williams announced his candidacy for the U.S. House of Representatives in Pennsylvania's 7th congressional district (map).

In November 2023, Williams announced his candidacy for the Republican nomination in the 2024 Pennsylvania Attorney General election.

He has since bucked party support, claiming the endorsements are the work of "Harrisburg insiders" propping up Sunday,[10][11] "a[n] inactive prosecutor who is as progressive as Larry Krasner in Philadelphia," according to Williams.