Cass R. Sunstein, Columnist

What Happens If Trump Is ‘Unable’ to Govern

A crash course in the 25th Amendment, from someone who was in the Justice Department when Reagan was shot.

Get ready for some constitutional ambiguities.

Photographer: Andrew Caballero-Reynolds/AFP/Getty Images

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Now that President Donald Trump has tested positive for Covid-19, the Department of Justice is almost certainly focusing on the 25th Amendment, which provides for the transfer of presidential authority to the vice president.

No one who works for a sitting president wants to think about that amendment. But in any administration, worst-case scenarios get attention, and if the president is sick, the lawyers and the vice president have to be clear on what the 25th Amendment says and requires.