Dale Earnhardt Jr. quotes JFK in response to kneeling protests

Dale Earnhardt Jr. walks through the garage area during practice for the Monster Energy NASCAR Cup Series Food City 500 at Bristol Motor Speedway on April 22, 2017 in Bristol, Tennessee. (Photo by Jared C. Tilton/Getty Images)

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After some NASCAR owners threatened to fire anyone who might protest during the national anthem Sunday, Dale Earnhardt Jr. took to Twitter and responded to national anthem protests that have engulfed the NFL.

Earnhardt Jr, a former Daytona 500 winner, is in his final season in NASCAR's premier series.

Earnhardt Jr., who has 2.2 million Twitter followers, has always been one to express his opinion on social media. He fired off this Tweet Monday:

Dale Earnhardt Jr. took to Twitter Monday in response to the national anthem protests that are sweeping the NFL:

Posted by Action News Jax on Monday, September 25, 2017