Dustin Johnson won his first career major in impressive fashion on Sunday at Oakmont Country Club, clinching the 2016 U.S. Open by shooting a 4-under 276.

Despite Johnson's performance, the discussion for most of his back nine and the immediate aftermath of the event was the USGA's decision to tell Johnson on the 12th tee that he may incur a penalty for his ball moving on the fifth green seven holes earlier. The USGA also mentioned that the review would take place after the round.

This drew the ire of Tiger Woods as well as Jordan Spieth, Rory McIlroy and other stars of golf who took to Twitter to voice their objections. The objections were both to the penalty being enforced and the decision to tell Johnson and the rest of the field about the review that would take place after the round.

On Monday, the USGA offered a statement on the matter:

"Upon reflection, we regret the distraction caused by our decision to wait until the end of the round to decide on the ruling. It is normal for rulings based on video evidence to await the end of a round, when the matter can be discussed with the player before the score card is returned. While our focus on getting the ruling correct was appropriate, we created uncertainty about where players stood on the leaderboard after we informed Dustin on the 12th tee that his actions on the fifth green might lead to a penalty. This created unnecessary ambiguity for Dustin and the other players, as well as spectators on-site, and those watching and listening on television and digital channels."