President Donald Trump has not held a single mock debate session, and has no plans to stage a formal practice round, as he readies for his first faceoff with Joe Biden in less than three weeks, according to multiple people familiar with the discussions.

The president has dismissed the typical debate preparations he participated in four years ago, joking to aides and allies that he’s been preparing for debates since he was born. His ability to fire back at an opponent in real time, he’s argued, “isn’t something you have to practice.”…

Not all of the president’s allies think his casual approach is a wise strategy. Privately, some of them are expressing concern that the president’s overconfidence could backfire.

In particular, they’re worried that Trump appears to be banking on a Biden misstep in the first 2020 debate; all the three debates are scheduled for 90 minutes each. They said Trump has repeatedly told aides that he’s not worried about debating Biden because the former vice president is likely to have a gaffe moment or stutter. Biden had a severe stutter as a child that he overcame.