http://www.comingsoon.net/tv/news/97...uce-boxleitner

Brent Spiner (Star Trek: The Next Generation, Star Trek: Enterprise) has exited his new role as vice president of the United States in season four of Supergirl due to scheduling issues, The Hollywood Reporter has confirmed. The news comes only three weeks after it was first announced that Spiner had joined The CW series.

Vice President Baker will now be played by Bruce Boxleitner (Tron, Babylon 5, NCIS). The character is described as an unlikely leader who will nonetheless step up in a big way when his country needs him. Boxleitner follows recent new additions to the series that include Rhona Mitra as the villainous Mercy Graves, Robert Baker as Mercy’s brother Otis, Sam Witwer as Agent Liberty, and Nicole Maines as television’s first transgender superhero Dreamer.