Vladimir Putin mentioned Bill Browder's name at his joint press conference with Trump in Helsinki on Monday. Browder is a financier behind the Magnitsky Act, which authorizes governments to sanction Russian human rights offenders and freeze their assets. The act is believed to threaten much of Putin's personal wealth, which is tied up in foreign assets. Putin offered to allow US officials to interview Russians suspected of interfering with the 2016 elections in exchange for interviewing people close to Browder.