"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 KerryDozens of Clinton meetings left off State schedule: report Overnight Cybersecurity: Sit-in disrupts cyber hearings | Trump tries to defend claim Clinton was hacked Kerry backs government access to encrypted data MORE (D-Mass.) is playing Mitt Romney in President Obama's debate practice, and Sen. Rob PortmanRob PortmanMcConnell quashes Senate effort on guns Poll: Burr narrowly leads Democrat in NC Senate race Hate TV customer service? So does your senator MORE (R-Ohio) is playing Obama in Romney's practice sessions.