The lawsuit centers on one of the president's longstanding complaints in the Senate race — the presence of a second candidate named Dan Sullivan who Republicans fear could siphon away votes from the incumbent in what's likely to be a photo-finish contest with Democrat Mary Peltola.

With the midterm elections less than two weeks away, a new legal battle is raising questions about the federal government's role in policing who is eligible to vote. A federal judge in California has blocked a Department of Homeland Security effort to identify noncitizens on voter rolls. White House correspondent Liz Landers reports.