( CNN) A leading critic of Russian President Vladimir Putin, American fiscal director Bill Browder, said Putin is “using everything he's got” in the wake of his summit and news conference in Finland with Trump, in which Putin mentioned Browder by name and conveyed a desire to interrogate him.

At the news conference with Trump in Helsinki, Putin created the subject of Browder after offering to let special advise Robert Mueller travel to Russia to be present for the questioning of the 12 Russian military officers indicted last week. Putin said that offer would be contingent on the US allowing Russians to interrogate certain Americans.

Putin indicated Browder would be of primary those who are interested in such an interrogation, and accused Browder's associates of funneling millions of dollars earned illegally in Russia into the US to aid the Hillary Clinton campaign.