Asked why after President Obama's birth certificate was produced in 2011 did Donald Trump continue to question its legitimacy year after year, Trump did not produce a clear answer, instead repeating that his theory did a great service for the country, as well as for the president.

"When I got involved, I didn't fail," Trump said. "I got him to get the birth certificate."

Trump claimed that Clinton's campaign attempted to do the same, but "failed."

"Nobody was pressing it, nobody was caring much about it, but I was the one that got him to produce the birth certificate and I think I did a good job," he said. 

Clinton, responding to Trump, probed the audience: "Just listen to what you heard."

Clinton called the birther movement "racist," bringing up a discrimination lawsuit he was involved in. 

Trump shot back at Clinton, saying that she treated Obama with "terrible disrespect" during their debates. "You were after him ... when you try to act holier than thou it really doesn't work."

As far as the lawsuit, Trump responded that a lot of people were sued and that he "settled the suit with zero admission of guilt."