Avowed Republican Caitlyn Jenner's vision has a bluer tint these days — she says in a preview of a forthcoming 20/20 interview that she has completely turned on President Donald Trump in light of his administration's stance on the transgender community.

In February, Trump scaled back protections reserved for transgender students first enacted by the Obama administration. Jenner immediately posted a reactionary video in which she called the decision "a disaster," and in the clip above, she expands on her criticism and says if Trump is unwilling to budge, she's ready to fight.

"Yes, I did vote for Trump but here's the deal breaker with the Republican party," Jenner says. "And the deal breaker is, you mess with my community, you do the wrong thing with our community, you don't give us equality and a fair shot, I'm coming after you."

"When it comes to all equality issues, for the entire LGBT community, what we need is federal guidance," she continues. "Just like the previous administration said that it was OK to serve as a trans person in the military. We have frontline people, OK? I'm talking Marines, trans guys, on the frontline, fighting for our country. I'm trying to get, especially the Republican party, to make a change."

And where changes are concerned, Jenner's undergone some, too. While she previously admitted in a September 2015 interview with The Ellen Degeneres Show that she did not support the right to marry for gay couples, she has concretely changed her mind.

"I am 100 percent behind gay marriage," she insists. "Let's clear that up right now."

Caitlyn Jenner: The Secrets of My Life airs Friday, April 21 on ABC.

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