The Nationals recalled King from Columbus on Saturday and then placed him on waivers. King had until Tuesday for a team to pick him up.
King, 34, last pitched on Wednesday against the Mets, giving up two runs in two-thirds of an inning. For the season, he pitched in 12 games and gave up four runs in 6 1/3 innings.
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.