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Image Mark Mazzetti Credit... Tom Williams

Our Washington investigations editor, Mark Mazzetti, who was a national security reporter for a decade, has spent the past year exploring the controversy clouding the 2016 presidential election and the Trump presidency.

Was there collusion between the Trump campaign and the Kremlin? What role did social media play? Did President Trump try to obstruct the F.B.I.’s continuing investigation? How vulnerable is the president to criminal charges for his conduct in office? Where is the investigation by the special counsel, Robert S. Mueller III, headed? How do reporters get this information?