"Law of physics requires that Biden would be making announcement about his decision pretty 'soon'," White House Press Secretary Josh Earnest said.
"He (Biden) has been considering this for some time, and I'm confident that once he has made a decision that he'll announce it, but he'll do so on his timeframe," Earnest said when pressed about it.
"Primarily people understand that this is an intensely personal decision for anybody to make in terms of a candidacy for president of the United States, all of my colleagues here at the White House have certainly afforded the vice president all of the time and space that he needs to make that personal decision, and he'll make that on a timeframe of his choosing," he said.
"I'm confident that as somebody who's participated in this process firsthand on a couple of occasions that he understands the timing pressure that he's under, but he'll make a decision when he's prepared to make it," the spokesman said.
"I think that his strong performance as vice president has led a lot of people to think that he would be an influential candidate, an effective candidate in a presidential field. But ultimately, this is not the kind of decision that can be made for the vice president, the vice president himself needs to make this decision," he said.