Former foreign policy advisor to President Donald Trump's election campaign, George Papadopoulos, leaves the US District Courts in Washington, DC, on Sept. 7, 2018. MANDEL NGAN/AFP/Getty Images
George Papadopoulos formally joined then-candidate Donald Trump’s presidential campaign on March 21, 2016, as a foreign policy adviser specializing in the Middle East and Israel. He would later become a central figure in the Trump–Russia collusion narrative.