Donald Trump Jr. has decided to skip an upcoming fundraiser for George P. Bush over what he sees as attacks on his father from the Bush family, according to several reports.

The website for the GOP fundraiser in New York next week appeared to have been taken down after Jeb Bush, father of George P. Bush, called on the president to end "this heartless policy" of separating families at the border. Axios first reported that Trump Jr. was pulling out of the event and considers his one-time pal "collateral damage."

George P. Bush is running for re-election as Texas land commissioner against Democrat Miguel Suazo.

"Children shouldn't be used as a negotiating tool," Jeb Bush said in a tweet Monday morning."[Trump] should end this heartless policy, and Congress should get an immigration deal done that provides for asylum reform, border security and a path to citizenship for Dreamers."

Representatives for the Bush campaign and Trump Jr. have not responded to requests for comment.

Children shouldn’t be used as a negotiating tool. @realDonaldTrump should end this heartless policy and Congress should get an immigration deal done that provides for asylum reform, border security and a path to citizenship for Dreamers. https://t.co/OOjv0vNeVg — Jeb Bush (@JebBush) June 18, 2018

Ever since Jeb Bush's unsuccessful campaign for president in 2016, when then-candidate Donald Trump routinely threw personal attacks on him throughout the Republican primary, the Bush and Trump families haven't been close. Former President George W. Bush and former first lady Laura Bush did not vote for a presidential candidate, a spokesman has said.

But George P. Bush and Donald Trump Jr. had remained above the tension after the land commissioner broke with his family to endorse Donald Trump for president in 2016. And earlier this spring, Trump Jr. and his father gave Bush their support during his competitive primary race.

"Elections are about choices. In 2016, [George P. Bush] endorsed [Donald Trump] and campaigned for him. His opponent attacked Trump and urged him to quit the race," Trump Jr. said. "Texas conservatives have a clear choice: Bush for Texas Land Commissioner."

Elections are about choices. In 2016, @GeorgePBush endorsed @realDonaldTrump and campaigned for him. His opponent attacked Trump and urged him quit the race. Texas conservatives have a clear choice: Bush for Texas Land Commissioner. — Donald Trump Jr. (@DonaldJTrumpJr) February 6, 2018

Texas LC George P. Bush backed me when it wasn’t the politically correct thing to do, and I back him now. Also, AC Sid Miller has been with me from the beginning, he is “Trump’s Man in Texas.” Also support Comptroller Glenn Hegar, and Railroad Commissioner Christi Craddick. — Donald J. Trump (@realDonaldTrump) February 27, 2018

Jeb Bush isn't the only one in his family to speak out against President Donald Trump's policy. Laura Bush, a Dallas resident and wife of former President George W. Bush, reacted to the policy in a column.

"I live in a border state. I appreciate the need to enforce and protect our international boundaries," she wrote, "but this zero-tolerance policy is cruel. It is immoral. And it breaks my heart."

George P. Bush hasn't commented on the administration's policy, though other statewide elected officials and some Texas lawmakers have asked the president to reverse course.

Last weekend, Bush was booed during his speech at the GOP convention, with dozens shouting, "Remember the Alamo!" Texans on both sides of the aisle have criticized Bush for his management of the landmark.