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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 KerryFrustrated Dems say Obama botched Russia response Budowsky: Dems madder than hell Tillerson: 'My view didn’t change' on Paris climate agreement MORE (D-Mass.) is playing Mitt Romney in President Obama's debate practice, and Sen. Rob PortmanRob PortmanA tale of two drug bills — one proposed bill will worsen the drug prices crisis Sanders to headline 'Don't Take Our Health Care' bus tour Rocky rollout for Senate healthcare bill MORE (R-Ohio) is playing Obama in Romney's practice sessions.