ET breaks down what Taylor Swift whispered to Travis Kelce after his AFC championship win.

The fulminations surrounding the world’s biggest pop icon — and girlfriend of Chiefs tight end Travis Kelce — reached the stratosphere after Kansas City made it to the Super Bowl.

For football fans eager to see a new team in the Super Bowl, the conference championship games on Sunday that sent the Kansas City Chiefs and San Francisco 49ers back to the main event of American sports culture were sorely disappointing.

But one thing is new: Taylor Swift. And she is driving the movement behind Donald Trump bonkers.

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The fulminations surrounding the world’s biggest pop icon — and girlfriend of Travis Kelce, the Chiefs’ star tight end — reached the stratosphere after Kansas City made it to the Super Bowl for the fourth time in five years, and the first time since Ms. Swift joined the team’s entourage.

The conspiracy theories coming out of the Make America Great Again contingent were already legion: that Ms. Swift is a secret agent of the Pentagon; that she is bolstering her fan base in preparation for her endorsement of President Biden’s re-election; or that she and Mr. Kelce are a contrived couple, assembled to boost the N.F.L. or Covid vaccines or Democrats or whatever.

“I wonder who’s going to win the Super Bowl next month,” Vivek Ramaswamy, the conspiratorial presidential candidate, turned Trump surrogate, pondered on social media on Monday. “And I wonder if there’s a major presidential endorsement coming from an artificially culturally propped-up couple this fall.”

The pro-Trump broadcaster Mike Crispi led off on Sunday by claiming that the National Football League is “rigged” in order to spread “Democrat propaganda”: “Calling it now: KC wins, goes to Super Bowl, Swift comes out at the halftime show and ‘endorses’ Joe Biden with Kelce at midfield.”

Other detractors of Ms. Swift among Mr. Trump’s biggest fans include one of his lawyers, Alina Habba, one of his biggest conspiracy theorists, Jack Posobiec, and other MAGA luminaries like Laura Loomer and Charlie Kirk, who leads a pro-Trump youth organization, Turning Point USA.

The right has been fuming about Ms. Swift since September, when she urged her fans on Instagram to register to vote, and the online outfit Vote.org reported a surge of 35,000 registrations in response. Ms. Swift had embarked on a world tour that helped make her a billionaire. Gavin Newsom, the California governor, praised her as “profoundly powerful.” And then Time magazine made her Person of the Year in December, kicking off another round of MAGA indignation.

The love story that linked her world with the N.F.L. has proved incendiary. Mr. Kelce’s advertisements promoting Pfizer’s Covid vaccine and Bud Light — already a target of outrage from the right over a social media promotion with a transgender influencer, Dylan Mulvaney — added fuel to that raging fire.