On Tuesday night, Donald J. Trump won another four nominating contests and officially became the presumptive Republican nominee. That’s despite the criminal charges, the judgments made against him in defamation and sexual abuse cases, the hundreds of millions of dollars in legal penalties and the continued fallout from the events of Jan. 6, 2021.

Considering all of that, we want to ask Republicans the same questions we posed to Democrats last week — and to answer them more directly than we have before:

How exactly did we end up with Donald Trump as the Republican nominee again? And why?

To answer these questions, we turn to two different branches of the Republican Party today.

First, we speak with Henry Barbour, who has been a member of the Republican National Committee since 2005, a consummate party insider. He supported Nikki Haley in the primary but now supports Mr. Trump. Then we speak with Vivek Ramaswamy, who ran against Mr. Trump for the nomination, but was most similar to the former president among the other candidates in terms of ideology and style. He now fully backs his one-time rival and embraces the MAGA philosophy he represents.

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