One of Richard Nixon's most famous quotes...right up there with "I am not a crook"... had to do with presidential immunity.
"When the president does it" he said "that means that it is not illegal." That idea \u2013 that you can't prosecute someone for actions taken as president - the Supreme Court has never actually ruled on it.
On Thursday, the Justices will take a crack, with the federal election interference case against former president Donald Trump hanging in the balance.
We preview how things might go.
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