Uncomfortable: Watch How Donald Trump Handles It When MSNBC Host Grills Him on Whether Obama Is a 'Legitimate' President

When MSNBC's Chris Matthews hit Republican presidential candidate Donald Trump about his past assertions that President Barack Obama may not be a legitimate president — presumably tied to Trump's doubts that Obama was born in the United States — Trump was mum on the matter.

“Is Donald Trump honest when he says that Barack Obama isn’t a legitimate president?” Matthews asked him Tuesday night.

"I don't talk about that anymore," Trump replied, adding that if he does answer the question, then “that’s all people want to talk about."

"We Catholics believe in confession," Matthews pressed. "You say you were wrong, and you move on." Then he dug deeper into Trump, asking if he really believes Obama isn't a legitimate president.

Trump wasn't going there: "I don't want to answer the question."

“I do think that's a blemish," Matthews told Trump as the interview drew to a close. "I think it’s your original sin. I’m an American. I think the president should be respected. And I think there’s a little ethnic aspect to it. I don’t like it. He's African-American, and we're saying he's not a real president. I don't like that. It's not a good thing about you. You're a mixed bag.”

As Matthews poured it on, Trump smiled and repeatedly said, "I understand" and "I know how you feel."

Trump and Matthews have sparred over this issue before.

(H/T: Mediaite)