How did Alec Baldwin construct his mischievously exaggerated, hyper-gesticulating, searingly funny portrayal of Donald J. Trump on “Saturday Night Live”? We hear him explain in his own words during a discussion with the journalist Sarah Maslin Nir, who conducted the first interview with Mr. Baldwin about the comedic role. We also talk about the real Mr. Trump’s busy week of global affairs in Germany, Turkey, Russia and Syria.

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