Shortly after the president delivered his remarks, massive applause and cheers were overheard pouring out of the White House, where hundreds of staff had gathered to watch their beloved boss deliver his historic address.

Biden sounded as if he were using a microphone to address his staff, starting with “Hello, hello, hello!” and being met with roaring applause.

At one point, it sounded as if the crowd broke into a chant of "Biden! Biden! Biden!"

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-ABC News' Molly Nagle and Mary Bruce

Pennsylvania Gov. Josh Shapiro, who sources tell ABC News is one of the front-runners for the vice president spot, posted a statement on X following Biden's speech.

"A patriot, a President who has gotten historic stuff done, and a fighter for our country," he said. before thanking him for his service

Former President Donald Trump made two posts on Truth Social reacting to Biden's speech, calling it "barely understandable, and sooo bad!"

He added that "CROOKED JOE BIDEN AND LYIN’ KAMALA HARRIS ARE A GREAT EMBARRASSMENT TO AMERICA"

-ABC News' Lalee Ibssa

First lady Jill Biden released a statement on X after the speech saying that her "heart is full of gratitude."

"Thank you for the trust you put in Joe—now it’s time to put that trust in Kamala. Love, Jill," she said.