>> reporter: critics seized after he was listed as model u.n. as a credential. he worked on the ben carson for president campaign where he says he prepared him for debates and before that, traveled to cyprus and the hudson institute. >> i jumped in with high level officials after leaving the bush administration. scooter libby, these are really my mentors. >> it's the job papadopoulos had just before he joined the campaign that seems to prove pivotal. this is the london center of international law practice. behind its unassuming brick facade lies one of the central mysteries of george papadopoulos's story. what is the london center? according to its website, they provide training to individuals