White House senior advisor David Plouffe struck at the Romney campaign’s honesty during an appearance on ABC’s “This Week” Sunday, saying that the campaign was based on an unprecedented foundation of falsehoods.

“Right now their campaign is built on a tripod of lies,” he said. “A welfare attack that is just absolutely untrue. The suggestion we’re raiding Medicare: absolutely untrue. And then this whole ‘we can’t build it’ nonsense.”

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“I don’t think we’ve ever seen a presidential campaign ever that’s built on a foundation of absolute lies. And I think ultimately they’re going to pay a price for that,” he added.

Statements made by Romney, Vice Presidential running mate Paul Ryan and other speakers from the Republican convention have been rigorously fact-checked and found false over the past week. A top strategist for former President George W. Bush even called Ryan out, also on “This Week,” for the may lies and half-truths in his convention speech.

As for the “tripod” Plouffe cited, fact-checkers have generally reached the same conclusions about those claims’ veracity. The charge that Obama gutted the work requirement—a line repeated numerous times during the Republican convention—received the worst ratings possible in terms of truthfulness from both Politifact (pants on fire) and the Washington Post (four pinocchios.) On Medicare, many have noted that Paul Ryan’s Medicare plan calls for the same budget cuts there as the ones he decries in Obama’s health care law.

Then there’s the “we built it” meme, a line used by seemingly every speaker at the Republican convention. That line of attack is based on a partial quote by President Obama that has been stripped of the original context to change the subject of the pronoun “it” from public infrastructure and services to private businesses.

Watch video of Plouffe below: