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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 Forbes KerryFor the sake of national security, Trump must honor the Iran deal Bernie Sanders’s 1960s worldview makes bad foreign policy DiCaprio: History will ‘vilify’ Trump for not fighting climate change MORE (D-Mass.) is playing Mitt Romney in President Obama's debate practice, and Sen. Rob PortmanRobert (Rob) Jones PortmanOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Reddit hires first lobbyists Senate panel approves bill compelling researchers to ‘hack’ DHS MORE (R-Ohio) is playing Obama in Romney's practice sessions.