Former South Carolina Governor Nikki Haley will kick off her campaign for the 2024 Republican presidential nomination this month, squaring off against her one-time boss, former President Donald Trump, two sources familiar with her plans said on Wednesday. The move would make her just the second declared Republican candidate and could set the stage for a more combative phase of the campaign, potentially putting her in the sights of the combative former U.S. president. Haley's campaign sent an email to supporters on Wednesday inviting them to a Feb. 15 event in Charleston. There she will declare her candidacy, the sources...