Cobb warned the investigation "will go through 2020."
That assessment pits Cobb against his former boss, President Donald Trump.
Many of the attorneys played key roles in the decisions to fire national security adviser Michael Flynn and FBI Director James Comey, Ty Cobb said.
"Late Show" host tears into Trump over latest White House hire.
One Twitter user suspects John Bolton's mustache told Ty Cobb's: 'There can be only one.'
Emmet T. Flood is slated to replace Cobb, who has led the White House's interactions with special counsel Robert Mueller's office.
Republican lawmakers have insisted that Trump let the special counsel to do his job.
When asked if he'd be willing to be interviewed for the probe, Trump was noncommittal.
These men are charged with representing and advising President Donald Trump, especially when it comes to the Russia investigation.
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