Donald Trump Doubles Down on Attacks of Bush Family The Republican candidate for president appeared on "This Week."

 -- Republican presidential frontrunner Donald Trump doubled down on his attacks of his rival Jeb Bush and his brother, former President George W. Bush, Sunday on ABC's "This Week."

“I think he did a terrible thing when he went into Iraq,” Trump said about the former president. The real estate mogul then criticized other Republicans for not going after Pres. Bush and instead being "politically correct."

At Saturday's debate in South Carolina, Trump got into a heated exchange with the former Florida governor about his brother's role in the 9/11 attacks.

"I'm sick and tired of him going after my family," Bush said to applause Saturday night. "While Donald Trump was building a reality TV show, my brother was building a security apparatus to keep us safe and I'm proud of what he did."

"The World Trade Center came down during your brother's reign. Remember that," Trump responded.

When pressed about his previous call to impeach Pres. Bush, Trump did not dispute that he said it but wouldn’t repeat it, saying it was “past time.”

Trump also shifted blame for the Affordable Care Act to the two brothers.

"Jeb Bush pushed him through the brother. They were close," Trump said referring to the appointment of Chief Justice John Roberts. "We have Obamacare because of Ted Cruz, Jeb Bush, and George Bush."