Story highlights Al Gore endorsed Hillary Clinton on Monday

Gore did not weigh in during the primary season

(CNN) Former Vice President Al Gore endorsed Hillary Clinton on Monday, the opening day of the Democratic National Convention in Philadelphia.

Gore, who served as President Bill Clinton's No. 2, said in a series of tweets that while he was not at the convention, he does indeed support her.

"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.

I am not able to attend this year's Democratic convention, but I will be voting for Hillary Clinton. (1/3) — Al Gore (@algore) July 25, 2016

Given her qualifications and experience -- and given the significant challenges facing our nation and the world, (2/3) — Al Gore (@algore) July 25, 2016

including, especially, the global climate crisis, I encourage everyone else to do the same. (3/3) — Al Gore (@algore) July 25, 2016

Gore drew headlines for not yet endorsing her, six weeks after she became the presumptive Democratic nominee.