Former U.S. ambassador to the United Nations Nikki Haley on Tuesday kicked off her campaign for the 2024 Republican presidential nomination, challenging her former boss Donald Trump, who holds a strong lead in a new Reuters/Ipsos poll.

"It's time for a new generation of leadership," Haley said in a video her team sent out by email as she joined Trump as the only announced 2024 candidates.

Haley, a former South Carolina governor who served as the U.N. ambassador under Trump from 2017 to 2018, is set to lay out her campaign plans in a speech on Wednesday in Charleston, South Carolina.