Nikki Haley wins backing from powerful Koch network as she aims to take on Trump

GOP presidential hopeful Nikki Haley speaks during a campaign event on Monday, in Bluffton, S.C. Haley is among a cluster of Republican candidates competing for second place in a GOP Republican primary thus far largely dominated by former President Donald Trump. (AP Photo/Meg Kinnard)

NEW YORK — Americans for Prosperity, the political arm of the powerful Koch network, formally endorsed Nikki Haley’s presidential campaign on Tuesday, promising to commit its nationwide coalition of activists — and virtually unlimited funds — to helping Haley defeat former President Donald Trump in the GOP primary contest.