Even strangers in elevators are asking him: are you going to run? Dr. Ben Carson sat down with Sean Hannity Monday night and revealed what he's thinking about a possible 2016 run for the White House.

Carson explained that he's been traveling all over the U.S. to speak and is being told that the crowds have never been bigger. Sean tried to nail down whether Carson is going to launch a campaign for the GOP nomination, but the former neurosurgeon would not commit.

He explained that his decision will be based on the kind of "enthusiasm" he sees for the other Republicans in the field.

"I don't want to do it, but if we're left in a situation where there's not a lot of enthusiasm for anybody else ... I would never turn my back on my fellow citizens," said Carson, noting that many people - even a stranger in an elevator that day - are telling him "you've got to do it."

He joked that at this point in his life, he figured he would be enjoying retirement after his long medical career.

Watch the discussion above, and check out Hannity tonight at 10p ET as Sean monitors the latest primary election results.

On Fox and Friends this morning, Dr. Carson discussed a range of topics including his new book, One Nation: What We Can All Do to Save America's Future. He revealed that after his 2012 National Prayer Breakfast comments, the event organizers called him and told him that the White House was "very upset" and asked him to call President Obama to apologize.

"I said, 'I talked to the president afterwards. He didn't seem upset and there's no reason that he should be unless what I said applied to him,'" Carson recalled.

Watch the rest of the interview below to hear Carson's take on the VA scandal and his response to a blogger calling him the GOP's "black avenger."