U.S. Sens. Lisa Murkowski and Dan Sullivan voluntarily resigned over the weekend as honorary members of the party's state central committee, Murkowski campaign spokesman Robert Dillon said Tuesday.

Party officers are expected to back party candidates. Last month, several GOP officers resigned their posts to publicly back Republican-turned-Libertarian Joe Miller in his challenge to Murkowski in this fall's Senate race.

State GOP chairman Tuckerman Babcock said Murkowski and Sullivan held their party leadership posts by virtue of holding elected office and would have those positions restored after the election.

On Saturday, after a 2005 video surfaced in which Trump made lewd comments about women, Murkowski said Trump had "forfeited the right to be our party's nominee."