In another punch to Jeb Bush, Donald Trump is taking on the establishment GOP candidate by purchasing Mr. Bush’s namesake online and redirecting the search to his own campaign website.

If an online searcher goes to www.jebbush.com, instead of going to a site that describes the former Florida governor and his quest for the White House, it redirects to Mr. Trump’s campaign website, which promises to “Make America Great Again.”

Mr. Trump has dug into his criticism of Mr. Bush, and his brother, former President George W. Bush, which he initiated in Saturday night’s GOP debate, where Mr. Trump questioned the Bush administration’s decision to enter the Iraq War and reminded viewers that the World Trade Center fell during Mr. Bush’s term.

During an interview on ABC’s “This Week” on Sunday, Mr. Trump doubled down on the attacks, saying the former president “did a terrible thing,” invading Iraq and criticized other Republicans for being too “politically correct” in not opening this line of questioning.

On Monday, Mr. Trump held a press conference just miles away and a few hours before a joint Jeb and George W. Bush rally, where he accused the Republican National Committee for stacking the debates with Bush supporters and donors and threatened to run as a third-party candidate if he’s not treated better by the establishment.

With less than a week until South Carolina’s Republican primary, polls show that Mr. Trump remains the leader of the pack by double digits.

A Public Policy Polling survey, which was conducted after Saturday night’s explosive debate, said Mr. Trump leads the GOP in the Palmetto State by 35 percent, with U.S. Sens. Ted Cruz and Marco Rubio tying for second at 18 percent support. Mr. Bush is tied for last place with retired neurosurgeon Ben Carson at 7 percent support, with Ohio Gov. John Kasich besting them both with 10 percent support.

• Editor’s note: Political reporter Kelly Riddell’s husband, Frank Sadler, was the campaign manager for Republican presidential contender Carly Fiorina.

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