FILE - In this Oct. 5, 2020, file photo, Kansas City Chiefs fans do "the chop" at the start of the team's NFL football game against the New England Patriots in Kansas City, Mo. The Chiefs barred headdresses and war paint amid the nationwide push for racial justice, but its effort to make its popular “war chant” more palatable is getting a fresh round of scrutiny from Native American groups as the team prepares to make its second straight Super Bowl appearance. (AP Photo/Reed Hoffmann, File)

FILE - In this Nov. 28, 2010, file photo, Kansas City Chiefs fans hold a sign that reads "TomaHAWK Chop," during an NFL football game between the Chiefs and the Seattle Seahawks in Seattle. The Kansas City Chiefs barred headdresses and war paint amid the nationwide push for racial justice, but its effort to make its popular “war chant” more palatable is getting a fresh round of scrutiny from Native American groups as the team prepares to make its second straight Super Bowl appearance. (AP Photo/Ted S. Warren, File)

FILE - In this Dec. 13, 2018, photo, Kansas City Chiefs fans chant and do the chop during the second half of the team's NFL football game against the Los Angeles Chargers in Kansas City, Mo. The Kansas City Chiefs have since barred headdresses and war paint amid the nationwide push for racial justice, but its effort to make its popular “war chant” more palatable is getting a fresh round of scrutiny from Native American groups as the team prepares to make its second straight Super Bowl appearance. (AP Photo/Charlie Riedel, File)