BATON ROUGE, La. (AP) — U.S. Sen. David Vitter says he won't be endorsing a candidate in the October special election for the 5th District congressional seat, representing northeast and central Louisiana.

Vitter, a Republican, said Thursday that he often doesn't get involved in races that have "two or more significant Republicans."

Two GOP state lawmakers — Sen. Neil Riser and Rep. Jay Morris — have announced they will seek the seat being vacated by Congressman Rodney Alexander.

Alexander is becoming veterans secretary for Gov. Bobby Jindal's administration.

Morris has accused Alexander and Jindal of trying to rig the sequence of events to help Riser, which the men deny.

Vitter says he doesn't know what Jindal's involvement was. But he added, "It's obviously a very quick election, and it's obvious that didn't happen by accident."