Nikki Haley, the former South Carolina governor, officially joined the presidential race on Tuesday, making her the first major candidate to challenge former president Donald Trump in the Republican primary.
Haley filed her candidacy papers with the Federal Election Commission and announced her bid in a video posted on Twitter.
Haley, who served as United Nations ambassador under Trump, is expected to frame her campaign as a contrast to the former president and seemed to indirectly take aim at him in her video announcement.
"You should know this about me. I don't put up with bullies. And when you kick back, it hurts them more if you're wearing heels," Haley said. "I'm Nikki Haley, and I'm running for president."
Haley is also scheduled to roll out her first campaign appearance in Charleston, S.C., on Wednesday.
Haley served as governor of South Carolina from 2011 to 2017. Other candidates expected to join the Republican primary include former secretary of state Mike Pompeo, Florida governor Ron DeSantis, and former vice president Mike Pence.