It isn’t complicated. Public interest demands John Bolton testimony at the Senate impeachment trial of President Trump.

That’s the necessary response to the New York Times report on Sunday — namely, its reporting that Bolton’s upcoming book will allege that Trump tied the release of military aid to Ukrainian President Volodymyr Zelesnky opening investigations into the business dealings of Joe Biden’s son, Hunter. If accurately reported — and that does appear to be the case — Bolton’s claims undercut the president’s defense of his conduct. Trump’s legal team says he did not withhold aid in order to extract a politically damaging investigation of his primary rival’s family. Bolton apparently says the opposite.