Gov. Roy Cooper (D-NC), a top contender for Vice President Kamala Harris’s vice presidential pick, withdrew himself from consideration on Monday.

It’s not immediately clear why Cooper has dropped out of being considered, who just days before was reported by some Democrats to be Harris’s top pick. His decision was reported by the New York Times. Politico has reported some influencing factors could be a potential run for Senate, his age and how his being out of the state to campaign might elevate Republican Lt. Gov. Mark Robinson, who is running for governor.