Arizona GOP Sen. John McCain on Sunday praised the choice of Wisconsin Rep. Paul Ryan as the Republican vice presidential candidate, calling him an "excellent choice" and supporting his tough-minded budget ideas amid continued attacks by Democrats.

"Nobody knows this issue better than Paul Ryan," McCain said on "Fox News Sunday."

McCain, the 2008 GOP presidential nominee, also turned the focus on Democrats, dismissing their argument that Ryan's budget proposals will end Medicare and "push granny off a cliff."

Democrats, McCain argued, have yet to come up with their own specific budget plan.

The attacks were led Sunday by Florida Democratic Rep. Debbie Wasserman Schultz and Obama senior campaign adviser David Axelrod, who both argued that Ryan's two budget proposals would end Medicare for seniors.

"Ryan One or Son of Ryan still leave seniors in dire straits," said Wasserman Schultz, chairwoman of the Democratic National Committee. Paul Ryan and his budgets would leave seniors with "massive gaps in coverage."