David Barstow and Susanne Craig, reporters for The New York Times, explain how they cracked open the biggest story of the campaign, overcoming nagging doubts to nail down Donald J. Trump’s tax returns. We also talk to Stuart Stevens, the chief strategist for Mitt Romney, about why the 2012 Republican nominee was so reluctant to release his tax returns and to Alex Burns, a Times reporter, about how the latest tax revelations are reshaping the last few weeks of the presidential campaign.

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