(CNN) - In his preparation to face Republican vice presidential candidate and House Budget Committee Chairman Paul Ryan, Vice President Joe Biden will rehearse by debating the committee's top Democrat, Rep. Chris Van Hollen, a source with knowledge of the debate preparations told CNN.
The decision signals the central role budget and entitlement issues may play in the debate and fall election, and follows the central role those issues have played since Paul was announced as presumptive Republican presidential nominee Mitt Romney's No. 2 nearly a week ago.
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It also puts Biden opposite someone who knows well Ryan and his fiscal prowess.
Van Hollen's role was first reported by The New York Times.
The Maryland congressman and Budget Committee ranking member was on the offensive against Ryan earlier on Thursday, accusing Ryan on an Obama campaign conference call of supporting giving "windfalls to the private [health] insurance companies" at the expense of taxpayers and the solvency of Medicare.
President Barack Obama will practice by debating 2004 presidential candidate John Kerry, CNN previously reported.
The vice presidential debate is slated to take place on October 11 at Centre College in Danville, Kentucky.
- CNN's Paul Steinhauser and Gregory Wallace contributed to this report