 Outside of that time range or while traveling abroad, Biden is more likely to have verbal miscues and become fatigued, aides told Axios. So I wonder how the chief of staff there, Biden's chief of staff, Ron Klain, I wonder how he feels about those particular aides talking to Axios. In any case, keep this in mind. From 10 a.m. to 4 p.m., Biden is dependably engaged. Outside of that time range, he's more likely to have verbal miscues and so on.