"Trump ... belittled ... George Papadopoulos, who pleaded guilty ... to lying to federal agents investigating Russia's interference in the 2016 election, tweeting that 'few people knew the young, low level volunteer named George, who has already proven to be a liar,'" the WashPost reports.
Why he matters: "[I]nterviews 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."