Gore: I'm voting for Clinton
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Former Vice President Al GoreAlbert (Al) Arnold GoreKey McConnell ally: Biden should get access to transition resources CNN acquires Joe Biden documentary 'President in Waiting' Former GSA chief: 'Clear' that Biden should be recognized as president-elect MORE announced he will vote for Hillary ClintonHillary Diane Rodham ClintonTrump says he'll leave White House if Biden declared winner of Electoral College Federal workers stuck it out with Trump — now, we're ready to get back to work Biden soars as leader of the free world 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 ClintonTrump says he'll leave White House if Biden declared winner of Electoral College Obama: 'Hopeless' to try to sell as many books as Michelle Dow breaks 30,000 for first time as Biden transition ramps up 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.