commission and the washington post reported that former workers from cambridge analytica said the firm sent foreigners to advise u.s. campaigns. tom hamburger is a reporter for the washington post. he's joining us now. tom, you and your colleague craig timberg, i want to walk through the reporting. you spoke with three people who used to work for cambridge analytica and they told you that concerns about the legality of cambridge analytica's work in the u.s. were a regular subject of employee conversations at the company. especially afrt -- after the 2014 election. so what kind of violations of law were they worried? about. >> they'd had a warning from an attorney employed by cambridge analytica to be careful and mindful of u.s. federal election law which prohibits foreign nationals from having a decision-making role in u.s. political kaix -- campaigns,