The White House on Wednesday didn't outright deny the possibility of minting a $1 trillion coin, an idea that's been floated as a way for the Obama administration to pay its debts if Congress were to fail to raise the debt ceiling in the coming weeks.

"There is no plan B, there is no backup plan. There is Congress's responsibility to pay the bills of the United States," White House press secretary Jay Carney said during his daily briefing.