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Van Hollen added that they have not yet actually started practice yet, although he's "had a meeting with the vice president."

"We'll kick into higher gear in a little bit," Van Hollen said.

In response to a question of who Van Hollen thought would play Biden in Ryan's debate prep, Van Hollen said he wasn't "going there."

The vice presidential debate is set for Oct. 11 at Centre College located in Danville, Ky. 

Sen. John KerryJohn KerryFBI Director Comey sought to reveal Russian election meddling last summer: report Congress, Trump need a united front to face down Iran One year ago today we declared ISIS atrocities as genocide MORE (D-Mass.) is playing Mitt Romney in President Obama's debate practice, and Sen. Rob PortmanRob PortmanMcCaskill investigating opioid producers Overnight Finance: Senators spar over Wall Street at SEC pick's hearing | New CBO score for ObamaCare bill | Agency signs off on Trump DC hotel lease GOP senators offer bill to require spending cuts with debt-limit hikes MORE (R-Ohio) is playing Obama in Romney's practice sessions.