DENVER (AP) — Colorado’s U.S. attorney, Jason Dunn, plans to resign as the Biden administration prepares to appoint new top federal prosecutors.

Dunn, an appointee of President Donald Trump, told Colorado Public Radio his resignation will be effective Feb. 28. He joined the U.S. attorney’s office in 2018, and he declined to speak of his future plans.

Dunn is one of more than 50 top federal prosecutors who were asked to resign — a normal occurrence in changes of U.S. presidential administrations.

Dunn’s successor will need to be confirmed by the U.S. Senate.

Colorado’s Democratic senators, Michael Bennet and John Hickenlooper, have recommended possible replacements, including Denver City Attorney Kristin Bronson, Assistant U.S. Attorney Hetal Doshi and Cole Finnegan, a former Denver city attorney who served as chief of staff to then-Denver Mayor John Hickenlooper.