From The Washington Post:

Mr. Allen had his security clearance suspended after the bureau accused him of having conspiratorial views about the Jan. 6, 2021, protest at the U.S. Capitol and of sympathizing with criminal conduct.

According to a November 2023 protected whistleblower disclosure sent by a SecD employee to lawmakers, Senior SecD officials Dena Perkins and Jeffrey Veltri launched an investigation against Mr. Allen because he emailed several news items within his office related to former President Donald Trump that were deemed conspiratorial.