U.S. President Joe Biden ended his reelection campaign on Sunday after fellow

Democrats lost faith in his mental acuity and ability to beat Donald Trump while

endorsing Vice President Kamala Harris to replace him as the party's candidate.

Biden, 81, in a post on X, said he will remain in his role as president and

commander-in-chief until his term ends in January 2025 and will address the nation this week.

It has been the greatest honor of my life to serve as your President.

And while it has been my intention to seek reelection

I believe it is in the best interest of my party and the country for me to stand down and to

to focus solely on fulfilling my duties as President for the remainder of my term," Biden wrote.

His initial statement had not included an endorsement of Harris

but he followed up a few minutes later with an expression of support.