President Donald Trump was in friendly territory at the CFP National Championship on Monday … with a loud applause breaking out when he was shown during the national anthem.

Nos. 45-47 hit Hard Rock Stadium in Miami Gardens for the Miami vs. Indiana matchup … and he brought Ivanka, Kai, and some more grandkids along for the ride.

Trump’s presence was felt early in the night … ’cause as “American Idol” star Jamal Roberts performed his rendition of the “Star-Spangled Banner,” the cams cut to him on the big screens.

The White House confirmed days ago Trump would soak in all the action in person … and as TMZ Sports reported, local officials beefed up security to make sure the night went off without a hitch.

That being said, lines to get into the stadium were pretty long hours before kickoff … but it looked like a packed house once things were underway.

Rihanna wasn’t about to stay shut out — after her bodyguard let a door hit her in the face, she fired off a perfect clapback, all caught on cam!

The singer was stepping out of NYC’s Four Seasons on Friday when a door swung straight into her face as her bodyguard strolled right on ahead — prompting her to laugh it off and clap back, “Such a gentleman you are!”

TBF, he wasn’t totally checked out — he just seemed way more focused on the pack of paps rushing in and forgot Rihanna was right behind him.

The video’s already making the rounds online — and yeah, no clue if the bodyguard’s cringing over that door-slam fail.

Local and federal authorities are investigating after a group of anti-ICE protesters crashed a Minnesota church service … and one of the demonstrators tells TMZ she’d still do it all over again.

Here’s the deal … the DOJ and local police are investigating after protesters interrupted a service at the Cities Church in St. Paul … which is getting major headlines because Don Lemon was in the mix live-streaming the incident.

Chauntyll Allen, leader of Black Lives Matter Twin Cities, who was among the group, tells TMZ … the jarring protest inside the church was necessary to make clear to the parishioners that having a pastor who is also an ICE official is unacceptable.