Jaguars owner Shahid Khan stands arm-in-arm with players prior to Sunday's game against the Ravens in London. (Photo via Jaguars)

Current Ravens players are joined by Ray Lewis (second from left) during a protest prior to Sunday's game against the Jaguars in London. (Photo via USATSI)

Running back Jay Ajayi was among several Miami Dolphins players to wear a shirt supporting former 49ers QB Colin Kaepernick before Sunday's game against the Jets. (Photo via AP)

New York Giants players and staff stand arm-in-arm on Sunday. (Photo via AP)

Eagles owner Jeffrey Lurie locks arms with players during a protest on Sunday. (Photo via AP)

Buffalo Bills players protest during the National Anthem on Sunday. (Photo via USATSI)

Members of the Denver Broncos kneel during the national anthem on Sunday in Buffalo. (Photo via USATSI)

Members of the New England Patriots kneel during the national anthem on Sunday. (Photo via AP)

Members of the Houston Texans lock arms prior to Sunday's game against the Patriots. (Photo via AP)

Detroit Lions owner Martha Firestone Ford stands with head coach Jim Caldwell and players during the National Anthem before the game against the Falcons. (Photo via USATSI)

Falcons owner Arthur Blank locks arms with running back Devonta Freeman and wide receiver Julio Jones on Sunday. (Photo via AP)

Most members of the Pittsburgh Steelers stayed in the locker room during the national anthem on Sunday in Chicago. (Photo via AP)

Members of the Chicago Bears lock arms during the national anthem on Sunday. (Photo via AP)

Members of the New Orleans Saints sit during the national anthem prior to their game against the Panthers. (Photo via USATSI)

Panthers defensive lineman Julius Peppers walks out to the field after staying in the locker room for the national anthem. (Photo via USATSI)

Bucs wide receivers Mike Evans and DeSean Jackson kneel during the national anthem on Sunday. (Photo via USATSI)

Members of the Minnesota Vikings lock arms during the national anthem on Sunday. (Photo via AP)

Members of the Miami Dolphins kneel during the national anthem on Sunday. (Photo via USATSI)

Members of the New York Jets lock arms during the national anthem on Sunday. (Photo via AP)

Members of the Colts kneel during the national anthem on Sunday. (Photo via USATSI)

Members of the Cleveland Browns kneel during the national anthem on Sunday. (Photo via USATSI)

For the second straight day, A's catcher Bruce Maxwell kneeled during the national anthem in Oakland. (Photo via USATSI)

After staying in the locker room for the national anthem, Titans players walk out to the field arm-in-arm on Sunday. (Photo via USATSI)

Referees stand on an empty Seattle Seahawks sideline during the national anthem in Nashville on Sunday. (Photo via AP)

Prior to Game 1 of the WNBA Finals, the entire Los Angeles Sparks team stayed in the locker room for the national anthem. (Photo via USATSI)

Members of the Cincinnati Bengals lock arms during the national anthem on Sunday. (Photo via USATSI)

Members of the Packers lock arms during the national anthem on Sunday in Green Bay. (Photo via AP)

Chargers linebacker Melvin Ingram kneels during the national anthem prior to Sunday's game against the Chiefs. (Photo via USATSI)

Chiefs running back Charcandrick West and defensive tackle Roy Miller place their hands on the shoulders of cornerback Marcus Peters during the national anthem on Sunday. (Photo via USATSI)

Owner Daniel Snyder joined his players in protest during the national anthem on Sunday night. (Photo via USATSI)

A Raiders coach puts his hand on a player's shoulder during the national anthem on Sunday. (Photo via AP)