“Today I want to offer my full support and endorsement for Kamala to be the nominee of our party this year," he said in a post on X. “Democrats — it’s time to come together and beat Trump.”

Biden's decision came as he has been isolating at his Delaware beach house after being diagnosed with COVID-19 last week, huddling with a shrinking circle of close confidants and family members about his political future. Biden said he would address the nation later this week to provide “detail” about his decision.

The decision marks a swift and stunning end to Biden’s 52 years in electoral politics, as donors, lawmakers and even aides expressed to him their doubts that he could convince voters that he could plausibly handle the job for another four years.