The billionaire businessman announced his decision in a raucous news conference at Trump Tower, the gold-hued skyscraper in midtown Manhattan where he launched his surging and front-running campaign for president.
"I have signed the pledge," Trump said, adding that he intends to win the nomination himself and face whoever the Democrats nominate.
"So I will be totally pledging my allegiance to the Republican party and the conservative principles for which it stands, and we will go out, and we will fight hard, and we will win," Trump said.
Trump did the same thing in 2016.
Faux outrage or low-info Trump supporters, I'll let y'all decide.
Donald Trump Signs Pledge To Back GOP's 2016 Presidential Nominee