Interviews and documents show that Papadopoulos was in regular contact with the Trump campaign’s most senior officials and held himself out as a Trump surrogate as he traveled the world to meet with foreign officials and reporters.

Papadopoulos sat at the elbow of one of Trump’s top campaign advisers, then-Sen. Jeff Sessions, during a dinner for campaign advisers weeks before the Republican National Convention, according to an individual who attended the meeting.

He met in London in September 2016 with a mid-level representative of the British Foreign Office, where he said he had contacts at the senior level of the Russian government.

And he conferred at one point with the foreign minister of Greece at a meeting in New York.