George W. Bush's former White House press secretary accused the media of being more critical of Vice President Mike Pence's decision to leave an NFL game Sunday than it is over players kneeling during the national anthem.

"Unbelievable. The MSM has been more critical of VP Pence for taking a stand than they have been of players for taking a knee," Ari Fleischer tweeted Monday morning.

He continued: "Bias in action: Pence walking out is a ‘stunt'. Players taking a knee is genuine. The MSM really doesn't get it."

Pence attended the Indianapolis Colts-San Francisco 49ers game Sunday, but walked out when several 49ers kneeled during the anthem.

Many in the media questioned whether Pence's walkout was premeditated, and how costly the trip would be to taxpayers.

"I left today's Colts game because @POTUS and I will not dignify any event that disrespects our soldiers, our Flag, or our National Anthem," Pence tweeted.

Trump has since said he his "proud" of his VP for leaving.

In a tweet Monday morning, Trump said Pence was "receiving great praise" for walking out of the game.