The investigations into the contacts between the Trump administration and Russia is now moving closer to Donald Trump's inner circle. Despite this, he is defiant and denies any contacts, or at least denies having known about any such contacts.
A suggestion for investigators: focus on Ivanka. While she appears to be only a minor player in the illegal activities, she is definitely dirty as well. Ivanka is Donald's favourite, and he would probably do anything to keep her out of jail.