Politico reported Sunday that freshman U.S. Rep. Kevin Yoder was among 20 lawmakers and staff who swam at the holy site during a fact-finding trip to Israel last August. Yoder was the only one not wearing clothes.
Yoder told The Kansas City Star he is "incredibly remorseful" and apologized for any embarrassment he has caused. He said it was dark and that he was only in the water for about 10 seconds.
Politico says the FBI is investigating but does not say why. It is not clear if Yoder broke any laws or if his actions generated complaints.
Yoder is unopposed for re-election in Kansas' 3rd District.