The theory of the one trillion dollar platinum coin has been around a few years. But recently Krugman decided to take a stance pro-coin. http://krugman.blogs.nytimes.com/2013/01/07/be-ready-to-mint-that-coin/
Should President Obama be willing to print a $1 trillion platinum coin if Republicans try to force America into default? Yes, absolutely,” Krugman wrote. “He will, after all, be faced with a choice between two alternatives: one that’s silly but benign, the other that’s equally silly but both vile and disastrous.