Nikki Haley has asked for Secret Service protection, citing increasing threats she has received as she runs for the Republican presidential nomination against former President Donald Trump. 

Haley, the former U.S. ambassador to the United Nations and now the lone major GOP candidate who is still challenging Trump, has said her campaign has "had multiple issues." 

"It's not going to stop me from doing what I need to do," she said, according to CBS News.

Haley is escorted by personal security at South Carolina campaign events, and local law enforcement is also present. The heightened security was not the norm for her campaign stops in Iowa and New Hampshire leading up to those nomination contests. 

Last week, Haley told reporters that threats are a reality of running for president and indicated her campaign was beefing up security.