Former U.N. ambassador Nikki Haley is facing pressure from some of her top fundraisers to either seriously compete with, or outright defeat, Donald Trump in next week's New Hampshire primary, after finishing third Monday in the Iowa caucus. "I would still like to see her get somewhere, but the mountain she has to climb is enormous," Andy Sabin, a New York businessman and Haley fundraiser, told CNBC. "As much as I like Haley, I don't even know what Trump could do to stop himself right now." Sabin plans to help raise money for Trump if Haley doesn't make it through the primary season, despite previously telling CNBC he wouldn't give the former president "a f---ing nickel." "He may be the only choice I have," said Sabin. Several Haley fundraisers who spoke to CNBC conceded that, unless she gets a ve