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.

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.

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