President Trump on Saturday announced the appointment of Ty Cobb, a veteran Washington lawyer with experience as a federal prosecutor and defense attorney, as special counsel at the White House.

Cobb, a partner at the Washington, D.C., law firm Hogan Lovells, was speculated to be taking over the White House's response to the growing investigation into possible collusion between the Trump campaign and Russia.

Cobb earned his law degree at Georgetown University after graduating from Harvard University.

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Trump has a separate legal team to represent him amid the Russia probes, led by his longtime New York-based lawyer Marc Kasowitz. Trump has repeatedly denied that his team colluded with Russia.

Earlier this week, Kasowitz made headlines when he responded to a critic in a profanity-laced email that was published by ProPublica.

"You don't know me, but I will know you," Kasowitz responded to the critic. "How dare you send me an email like that. I'm on you now. You are f---ing with me now. Let's see who you are. Watch your back, b----."

Kasowitz apologized after emails of the conversation were made public.

Updated: 2:18 p.m.