Washington, D.C. ? Republican Sen. David Vitter of Louisiana says he supports conservative organizations challenging President Barack Obama’s citizenship in court.

Vitter, who is running for re-election, made the comments at a town hall-style event in Metairie, La., on Sunday when a constituent asked what he would do about what the questioner said was Obama’s “refusal to produce a valid birth certificate.”

Such claims about Obama’s birth certificate have been discredited. But with the crowd applauding the question, Vitter responded that although he doesn’t personally have legal standing to bring litigation, he supports “conservative legal organizations and others who would bring that to court,” according to a video of the event.