Mark Teixeira is coming out of retirement -- but rather than playing baseball, the World Series champ is running for United States Congress in Texas -- vowing to fight alongside President Trump!
45-year-old Teixeira, who played 16 seasons in the Big Leagues, made the announcement on his official X page ... describing himself as a "Proven winner ready to fight for Texas families, conservative principles, and the America First agenda."
The 3x MLB All-Star is running to fill Chip Roy's seat in Texas' 21st District .