Earnhardt posted the tweet on Monday less than 30 minutes after Trump tweeted that he was \"so proud of NASCAR and its supporters and fans\" for not \"disrespecting\" the country and the flag.

So proud of NASCAR and its supporters and fans. They won't put up with disrespecting our Country or our Flag - they said it loud and clear!

— Donald J. Trump (@realDonaldTrump) September 25, 2017

At a rally in Alabama last Friday, Trump suggested that NFL owners should fire players who protest the national anthem.

\"Wouldn’t you love to see one of the NFL owners, when somebody disrespects our flag, to say 'Get that son of a b---- off the field right now?'\" the president said.

If a player wants the privilege of making millions of dollars in the NFL,or other leagues, he or she should not be allowed to disrespect....

— Donald J. Trump (@realDonaldTrump) September 23, 2017

...our Great American Flag (or Country) and should stand for the National Anthem. If not, YOU'RE FIRED. Find something else to do!

— Donald J. Trump (@realDonaldTrump) September 23, 2017

In response, NFL owners took a unified stand against Trump's comments at the start of several games on Sunday.

Several NASCAR team owners and executives said Sunday that they would not want anyone in their organization to protest, The Associated Press reported.

Among them was Richard Childress -- the longtime team owner for Earnhardt's father -- who said protesting would \"get you a ride on a Greyhound bus,\" according to the AP.

\"Anybody that works for me should respect the country we live in,\" Childress said. \"So many people gave their lives for it. This is America.\"

Earnhardt has spoken out against the president's policies in the past. In January, the legendary NASCAR driver had a Twitter conversation with a fan in response to Trump's immigration ban, saying that \"America is created by immigrants.\"

\"[My] fam immigrated from Germany in 1700s escaping religious persecution,\" Earnhardt said.

\"PHOTO:
Sean Gardner/Getty Images
PHOTO: Dale Earnhardt Jr., driver of the no. 88 AXALTA Chevrolet, prepares to drive at Richmond International Raceway on Sept. 8, 2017, in Richmond, Va.
>

In April, Earnhardt, 42, announced that he would retire at the end of the year after driving for 18 seasons and competing in more than 600 races.

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