Nationals GM Mike Rizzo acknowledged Friday that he confronted an umpire following his team's loss to the Mets on Thursday.

"It was more about the frustration with the inconsistency and ambiguity of the rules than it was about any specific call," Rizzo said, according to The Washington Post. "There were three calls [Thursday] night that were interpreted in different ways. There was a call May 10 against the Detroit Tigers that was interpreted in a different way. It was about that. It was unfortunate."