Joe Biden plans to announce his withdrawal from the presidential race as early as Saturday,  but most likely on Sunday, longtime journalist Mark Halperin is reporting.

Biden’s agreement to step down was “brokered by Nancy Pelosi and others,” Halperin reported during a live 2Way broadcast posted on Youtube.

Democrat calls for Biden to step down reached a fever pitch last week, but briefly went quiet after the shocking assassination attempt against Donald Trump in Butler, Pennsylvania Saturday. The chatter resumed in earnest this week with more top Democrats joining the chorus, and scheming behind the scenes.

Biden’s announcement speech, according to Halperin’s multiple sources in “Biden world” is being written by presidential biographer Jon Meacham.

Biden is reportedly not resigning from the presidency and not endorsing Kamala Harris.

Instead, the state of play involves an open convention with Harris and about three other top Democrats vying for the nomination. Harris is said to be vetting at least four possible running mates, including Kentucky Governor Andy Beshear and possibly Pennsylvania Governor Josh Shapiro.

How Democrats plan to change the rules this late in the game “is very much TBD” (to be determined), Halperin said, but “there is an understanding that super delegates will not be allowed to vote on 1st ballot” at the Democrat National Convention.