Well, this is nuts ...
Mark Cuban and Sen. Ted Cruz are calling each other out about everything from the NBA's handling of anthem protests to China ... but the focus seems to be on who's got the bigger balls.
It all started when a radio talk show host from Texas tweeted at the Dallas Mavericks owner that if any of his players kneel during the national anthem when the season resumes next week, he won't support the team anymore.
Cuban responded -- "Bye" ... adding, "The National Anthem Police in this country are out of control.