Nick Bosa made it clear he's supporting Donald Trump for president ... the 49ers star defensive end crashed his teammates' post-game interview on live TV -- rockin' a MAGA hat!
The former Defensive Player of the Year pulled off the photo bomb after the Niners beat the Dallas Cowboys 30-24 at home at Levi's Stadium.
NBC reporter Melissa Stark was chatting with Brock Purdy, George Kittle, and Isaac Guerendo when Bosa suddenly appeared in the frame from behind.