Trump learned his, "shift the focus and blame someone else" skills from McCarthy's right hand man Roy Cohn.  The McCarthy/Cohn tactic was to attack anyone who investigated the 1950's Witch hunt hearings in the House.  Roy Cohn was Trump's mentor and lawyer in NYC in 1970s., What Trump is hiding about his Russian relationships, who knows.  I guess it has to do with laundering the ex-KGB/New Russian Mafia's money that has been stolen from the Russian people.  All those Russian industries, from mining to oil to making rubber tires ended up being transferred from State ownership to Putin's KGB buddies ownership, the people working these factories got screwed. The Russian nation got screwed.  That stolen money has had to be laundered somehow.  Trump's tangled web of land ownership business model is perfect for hiding assets.  It's no wonder he would not like to share his tax returns with us commoners.