Trump mocks Jeb’s campaign appearance with brother

Republican presidential front-runner Donald TrumpDonald TrumpHarris stumps for McAuliffe in Virginia On The Money — Sussing out what Sinema wants Hillicon Valley — Presented by Xerox — The Facebook Oversight Board is not pleased MORE early Monday mocked rival Jeb Bush for a scheduled campaign appearance with the former Florida governor’s brother, former President George W. Bush.

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Trump tweeted that it was “funny” that Jeb Bush didn’t “want help from his family in his failed campaign and didn’t even want to use his last name.”

Trump asked in a later Tweet if George W. Bush's appearance means he is "fair game" for questions about the World Trade Center, Iraq War and "eco collapse."

Jeb Bush and George W. Bush are scheduled to appear together at their first campaign rally Monday evening in North Charleston, S.C., ahead of the Palmetto State’s primary.

George W. Bush, who is popular in South Carolina, last week was featured in a radio ad in which he touted his brother as a "steady leader."

"We live in troubled times, with the military deployed around the world. We need a strong leader with experience, ideas and resolve," the former president says in the ad.

Jeb Bush, coming off a fourth-place finish in the New Hampshire primary, is averaging 10 percent support in South Carolina, behind Trump, Ted CruzRafael (Ted) Edward CruzOvernight Health Care — Presented by Carequest — Colin Powell's death highlights risks for immunocompromised The Senate confirmation process is broken — Senate Democrats can fix it Australian politician on Cruz, vaccines: 'We don't need your lectures, thanks mate' MORE, Marco RubioMarco Antonio RubioSenate GOP campaign arm outraises Democratic counterpart in September House passes bills to secure telecommunications infrastructure Senators call for answers from US firm over reported use of forced Uyghur labor in China MORE and John Kasich.

Trump earlier this month said Jeb Bush "had to bring in mommy” for help after Barbara Bush said it was “unbelievable” to think that women could support the real estate mogul.

“Wow, Jeb Bush, whose campaign is a total disaster, had to bring in mommy to take a slap at me,” Trump tweeted then. “Not nice!”

--This report was updated at 9:07 a.m.