A former Trump adviser filed a lawsuit that could be 'one of the most consequential separation of powers cases' in history

Donald Trump.
(Image credit: NICHOLAS KAMM/AFP via Getty Images)

Which branch trumps the other?

Charles Kupperman, President Trump's former deputy national security adviser under former National Security Adviser John Bolton, filed a lawsuit Friday asking a federal judge to rule whether he must testify in the congressional impeachment inquiry. House Democrats subpoenaed Kupperman, but the White House instructed him not appear before Congress, arguing he — along with Trump's other close advisers — is immune from testifying. And Kupperman really doesn't know what to make of it.

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Tim O'Donnell

Tim is a staff writer at The Week and has contributed to Bedford and Bowery and The New York Transatlantic. He is a graduate of Occidental College and NYU's journalism school. Tim enjoys writing about baseball, Europe, and extinct megafauna. He lives in New York City.