WASHINGTON (AP) — The governors of Virginia and Maryland clashed over Medicare and taxes as they debated presidential politics again on national television.

Virginia Gov. Bob McDonnell and Maryland Gov. Martin O'Malley appeared Sunday on "Meet the Press" in the latest in a series of head-to-head confrontations for the pair.

When asked about calls by Democrats for Republican candidate Mitt Romney to release his tax returns, O'Malley, who chairs the Democratic Governors Association, said Romney is avoiding taxes by using offshore accounts. McDonnell, who heads the Republican Governors Association, said O'Malley was flat wrong, calling the comments reckless and slanderous.

On Medicare, O'Malley said Romney's plan will cut health-care spending for seniors. McDonnell responded that Medicare needs to be reformed to provide for future generations and the GOP plan will give people choice.