Republican presidential candidate and former U.S. Haley will announce she's ending her campaign in remarks at 10 a.m., the source said. The "ball is in his court," a source close to the Haley campaign said, referring to the former president. Her campaign had a slow start, but she gained momentum after multiple strong debate performances last summer and fall. That criticism grew more strident as the race narrowed and Haley moved into one-on-one combat with Trump on the campaign trail.

---

Persons: Nikki Haley, Michael Haley, Haley's, Haley, Donald Trump, Joe Biden, Trump, Trump's, —, Haley's Trump Organizations: U.S, United, South Carolina National Guard, Clemson University, Greenville ONE, Republican, Former South Carolina Gov, Vermont, NBC News, Trump, NBC, GOP, Trump Republicans Locations: Greenville , South Carolina, U.S, Vermont, New Hampshire