President Donald Trump on Sunday escalated his call for the Washington Commanders to change their name back to the “Redskins,” threatening to restrict the NFL team’s stadium deal if they don’t, though it’s unclear how he would be able to.

The President said there is “a big clamoring” for the football team of the U.S. capital to bring back its previous branding, which was offensive to some Native Americans.

U.S. President Donald Trump threatened on Sunday to interfere with a deal to build a new football stadium in Washington, D.C., unless the local NFL team, now known as the Commanders, changes its name back to Redskins.