NBA coach Gregg Popovich had more than basketball on his mind before his San Antonio Spurs played the Milwaukee Bucks in Milwaukee on Sunday.

The outspoken Popovich, referring to the weekends March For Our Lives in Washington to push for gun control, ripped President Donald Trumps cowardice for leaving town instead of meeting with protesters.

The march attracted hundreds of thousands to rally for tougher gun laws after last months Parkland, Florida, mass shooting and other school killings. Trump proposed tightening some laws earlier this month, but apparently backed down after meeting with National Rifle Association representatives. He spent the weekend at his resort in Florida and failed to acknowledge the protest.