Iran Press/ America: "I'm Nikki Haley and I'm running for president," Haley said in a video that her team sent out by email.
Haley, a former South Carolina governor who served as US ambassador to the United Nations under the Trump administration, will lay out her campaign plans in a speech in Charleston, South Carolina, on Wednesday.
She became Trump's first direct challenger in a Republican field expected to grow in the coming weeks and months.
Her announcement was a sign the Republican nomination race is picking up steam.
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