Bob Dole, the 1996 GOP presidential nominee, said he's disappointed in Jeb Bush for sitting out the Republican National Convention.

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Dole, who initially endorsed Bush for president before the former Florida governor dropped out, said he should unite behind the party and support presumptive GOP presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

"I'm really disappointed that he's now — I watched him on TV going after Trump. I mean, Trump was on the stage with him and Trump said some things that I know upset Jeb, but they did sign the pledge," Dole said in an interview with The Washington Post.

"I am sorry I'm not going to see him in Cleveland."

All of the Republican presidential candidates signed a pledge during the primaries that they would support the eventual nominee, and Trump has repeatedly lashed out at Bush and other rivals who continue to criticize him.

Bush has said he won't vote for Trump or presumptive Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE, and in an op-ed in The Washington Post Saturday he wrote: "I do not believe Donald Trump reflects the principles or inclusive legacy of the Republican Party. And I sincerely hope he doesn't represent its future."

Dole noted that he attended the 1988 convention after getting beaten in the primaries by Bush's father, President George H.W. Bush.

"I have great respect for the Bush family, particularly Bush 41," Dole said.

Dole endorsed Trump in May, saying it is important to honor the voters' wishes, support Trump and defeat Clinton.