Donald Trump surprised everyone when he took the podium in Charlotte, North Carolina and did something unprecedented.
The man who has corralled support with his refusal to back down on comments no matter how divisive or provocative appeared repentant at the rally overnight.
Mr Trump, the man also who called Rosie O’Donnell a pig, a woman “disgusting” for breastfeeding and implied Mexican illegal immigrants are rapists and criminals, had something (reportedly scripted) to get off his chest.
“As you know I am not a politician,” he told his avid supporters. “I have never wanted to learn the language of the insiders and I have never wanted to be politically correct, it takes far too much time.
“Sometimes, in the heat of debate and speaking on a multitude of issues, you don’t choose the right words or you say the wrong thing. I have done that, and believe it or not, I regret it. I do regret it, particularly where it may have caused personal pain.”
His opponents have capitalised on his ability to offend after recent comments sparked more intensified criticism.
But there have been many moments throughout his Republican campaign where Mr Trump has been accused of speaking out of turn, and confusion continues to mount over which comments Mr Trump could be referring to.
Here is a list of remarks he could be apologising for:
“If you look at his wife, she was standing there,” Mr Trump said.
“She had nothing to say. She probably, maybe she wasn't allowed to have anything to say. You tell me.”
In a second interview with the New York Times, he added: “I'd like to hear his wife say something.”
Ms Khan responded with an essay in the Washington Post, where told Mr Trump she did have something to say.
“Here is my answer to Donald Trump: Because without saying a thing, all the world, all America, felt my pain. I am a Gold Star mother. Whoever saw me felt me in their heart.
“I cannot walk into a room with pictures of Humayun. For all these years, I haven’t been able to clean the closet where his things are — I had to ask my daughter-in-law to do it. Walking onto the convention stage, with a huge picture of my son behind me, I could hardly control myself. What mother could? Donald Trump has children whom he loves. Does he really need to wonder why I did not speak?”
The 70-year-old billionaire kick-started his campaign with a slew of claims about Mexicans as part of his promise to build a “fabulous” wall. When challenged on his evidence for some of his assertions, he had this to say:
“Well, somebody's doing the raping, Don! I mean somebody's doing it! Who's doing the raping? Who's doing the raping?”
“In many respects, you know, they honour President Obama,” Mr Trump told a crowd in Florida. “He’s the founder of Isis. He’s the founder of Isis. He’s the founder. He founded Isis.” These comments did not sit well and Mr Trump found himself embroiled in yet more controversy. He later clarified that his comments were sarcastic.
