Marc Kasowitz

Reports show that Trump's personal lawyer, Marc Kasowitz, also represented Columbus Nova, an investment firm with ties to Renova Group and Russian billionaire Viktor Vekselberg.

• By Justin Elliott

After hearing Rachel Maddow discuss a recent story about Kasowitz, a man emailed the attorney urging him to resign. Kasowitz responded with threats and profanity.

• By Justin Elliott

Colleagues say Marc Kasowitz, Trump's attorney on the Russia investigation, has struggled with alcohol abuse and engaged in behavior that left employees uncomfortable.

• By Justin Elliott & Jesse Eisinger