GOP presidential candidate Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE said on Wednesday that former Florida Gov. Jeb Bush is trailing him in multiple national polls because of his family’s name.

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“Jeb is failing,” Trump told host Laura Ingraham on “The Laura Ingraham Show.” “Part of the reason he is failing is his brother,” referring to former President George W. Bush.

“His brother went in and attacked the wrong people,” Trump said of George W. Bush’s controversial invasion of Iraq in 2003. “I’m not a big fan. You have to attack the right target.”

Jeb Bush has struggled at times on the 2016 campaign trail in handling the legacy of his brother and father, former President George H.W. Bush. The younger Bush has said he is proud of their accomplishments but would be his own man on policy.

Reports Wednesday said that George W. Bush will fundraise for his brother on Sept. 10 in New York City, one day before the 14th anniversary of the 9/11 terrorist attacks there.

Trump said he isn't concerned with the former president’s increasingly public support of his sibling’s Oval Office bid.

“I don’t care how much money he raises,” the celebrity real estate magnate said of the Bush family’s upcoming donor drive. “Jeb is down to 5 or 6 percent in some of these places. He has not been taking the ball.”

“Does he know what he’s doing?” Trump asked of Jeb Bush. “I have no idea. He’s a very low-energy person. He is not going to set this country right again."

Trump also charged that Jeb Bush is mistaken for criticizing the outspoken billionaire’s official immigration platform as unworkable.

“My plan is very practical,” he told Ingraham. “It will be a very humane plan.”

Trump’s immigration policies include securing America’s borders, more strictly enforcing current immigration laws and putting the needs of U.S. citizens first.

He has also vowed to build a border fence at Mexico's expense, floated ending automatic birthright citizenship and deporting illegal immigrants already in the country.

Trump said his plan's details are part of why his 2016 campaign is resonating with voters.

“They love the wall, they love the fact that you have to be legal to be in this country,” Trump said.

“It will make all of us feel better about our country."

Trump has made immigration a centerpiece of his campaign, arguing that the political establishment was ignoring voter concerns over the issue before his entry into the 2016 race.

—This story was updated at 11:29 p.m.