Elbridge Colby is a hot pick to be Donald Trump's national security adviser if the former president returns to the White House next year. It's a role which holds huge sway over America's position on the world stage.

An influential voice in foreign policy circles in Washington, Colby leads the Marathon Initiative, a conservative think tank grappling with how America confronts an increasingly assertive China — a subject that is testing both Democrats and Republicans. 

In this week's edition of Power Play, host Anne McElvoy talks to Colby, who served as deputy assistant secretary of defense in the Trump administration, about U.S. strategy towards China, Russia and Europe — and whether America can rely on its traditional allies.

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