directs our attention to Matt Yglesias
who directs our attention to Section 31 § 5112 clause (k)
of the US Code:
(k) The Secretary may mint and issue platinum bullion coins and proof platinum coins in accordance with such specifications, designs, varieties, quantities, denominations, and inscriptions as the Secretary, in the Secretary’s discretion, may prescribe from time to time.
The tactic may sound crazy, but I see nothing here to prevent the Secretary of the Treasury from issuing coins worth -- hmmm...y'think a hundred K will do it? -- in quantities sufficient to pay off the national debt.
I'd like to design this new coin. Suggestion: