Their friendship started after an introduction by means of Donald J. Trump’s sister. It ended practically 20 years later, when Mr. Trump refused to concede the 2020 election to Joseph R. Biden Jr.

In between, Chris Christie, the previous governor of New Jersey, and Mr. Trump had a relationship that may very well be genuinely heat, with chats about politics and present occasions, and at different instances transactional.

Mr. Christie gave Mr. Trump a lift by endorsing his 2016 candidacy after ending his personal bid for the…

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