No reason was given for the departure of Driscoll, who is a friend of Vice President JD Vance, but tensions with Defense Secretary Pete Hegseth have been widely reported.
The highest-ranking officer in the U.S. military says there are no plans to send troops to polling places during November's midterm congressional elections.
The New York Times said in a statement that denying American journalists access to an event in the U.S. is "not just another disturbing effort by the administration to undermine independent journalism, but a blatant attempt to evade public scrutiny."
The fighting comes just days after the Trump administration said it would turn its focus to increasing economic pressure — rather than military action — to try to end its war with Iran.
The U.S. military is experiencing a "beyond critical" shortage of advanced missile interceptors in Europe largely driven by President Donald Trump's war with Iran, a U.S. defense official in Europe and a NATO official told The Associated Press, raising concerns about vulnerabilities in NATO countries to a potential Russian attack.