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Aides to 2012 nominee Mitt Romney confirmed to The Hill on Thursday that he too would not attend.

The lack of former nominees reflects the divisions between establishment party leaders and Trump, who Republican National Committee Chairman Reince Priebus referred to Tuesday as the party’s “presumptive nominee.”

“It sends the message that there’s a split in the Republican Party at the highest levels on their disapproval for Trump. That isn’t helpful for enthusiasm,” GOP strategist Ron Bonjean said.

“It’s very clear that this is because they disagree with Trump on his policies and politics, and they don’t want to be associated with him either for political or legacy reasons.”

Trump has certainly not played nice with the three most recent nominees. He warred with Romney earlier this year after the former governor bashed Trump in a speech.

Last summer, Trump mocked McCain for being a prisoner of war. And earlier this year, he blamed George W. Bush for the Sept. 11, 2001, terrorist attacks.

While an aide to George H.W. Bush noted that the former president’s mobility issues would prevent him from attending, other former candidates didn't specify why they wouldn’t be traveling to Cleveland.

Previous nominees are typically mainstays at party conventions.

The elder Bush attended each convention from 1996 through 2008, only skipping the 2012 convention because of health issues. And Ronald Reagan spoke at both the 1988 and 1992 conventions, before health issues kept him away from the subsequent conventions before his death in 2004.

President George W. Bush, however, skipped the convention in 2008 because he was responding to Hurricane Gustav. He also skipped the 2012 convention in what many thought was an effort to avoid harming Romney.

Not all Republicans believe the message sent by skipping the Trump convention will last.