Gore: I'm voting for Clinton
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Former Vice President Al GoreAlbert (Al) Arnold GoreLieberman: Trump should ‘stand back’ from the Florida recount Florida races head to recounts Ex-Bush strategist: Count all the votes in Florida, don’t repeat mistakes of 2000 MORE announced he will vote for Hillary ClintonHillary Diane Rodham ClintonSinema invokes McCain in Senate acceptance speech Sinema defeats McSally in Arizona Senate race Hillicon Valley: Social media struggles with new forms of misinformation | US, Russia decline to join pledge on fighting cybercrimes | Trump hits Comcast after antitrust complaint | Zuckerberg pressed to testify before global panel MORE on Monday, the same day he also said he'd skip the Democratic National Convention.

"I am not able to attend this year’s Democratic convention, but I will be voting for Hillary Clinton," he said in a series of tweets.

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"Given her qualifications and experience -- and given the significant challenges facing our nation and the world, including, especially, the global climate crisis, I encourage everyone else to do the same," he tweeted.

Gore had been the highest-ranking Democratic holdout for the Clinton campaign and refused to back the former secretary of State, even as it became clear she would be the Democratic Party's presidential nominee. When asked in late May if he'd endorse Clinton, Gore said he would "back the Democratic nominee."

The relationship between Gore and the Clintons has been strained since 2000, when Gore kept then-President Bill ClintonWilliam (Bill) Jefferson ClintonOn The Money: Dems mark Trump tax returns as key part of agenda | Waters defends planned probe of Trump finances after GOP backlash | Reports: Trump mulls replacing Commerce chief Ross by end of year Dems mark Trump tax returns as key part of agenda After the hype: A ‘softer’ Trump, collegial Pelosi MORE at a distance during his own presidential bid, despite the president's high approval ratings.

Reports surfaced last year that Gore aides were buzzing about a potential presidential bid that never materialized.

— This report was updated at 2:37 p.m.