The sparks flew in the first U.S. presidential debate Tuesday night between Kamala Harris and Donald Trump. How will the encounter shape the final stretch of the campaign to the Nov. 5 election — and what does it mean for the rest of the world? 

Host Anne McElvoy talks to POLITICO’s Global Editor-in-Chief John Harris, a doyen of debate coverage, about Harris's goading of Trump and whether it marks a shift in the campaign. She is joined by John B. Emerson, a prominent Californian Democrat, who has raised funds for Kamala Harris in her home state. Having served in the Clinton administration before becoming the U.S. ambassador to Germany, Emerson discusses the impact of the debate on America’s allies. 

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