President Obama is preparing a direct attack against Mitt Romney and Paul Ryan on their plan for Medicare.

The Obama campaign released a new ad this morning warning voters that Romney and Ryan would “end Medicare as we know it.”

The ad features Paul Krugman warning that Paul Ryan’s “voucher” plan would mean that “tens of millions of older Americans would not be able to afford essential care.”

Obama traveling Press Secretary Jen Psaki, explained to voters this morning that Obama planned to feature Medicare attack points in a speech later today.

“[H]e will lay out the choice between his plan and  the Romney-Ryan plan to end Medicare as we know it, leaving new retirees with nothing but a voucher in place of the guaranteed benefits they rely on today,” she said. “This kind of plan forces people with Medicare to pay an extra $6400, all so Mitt Romney and Paul Ryan can give tax cuts to millionaires and billionaires.”