Unless Congress raises the debt limit by Nov. 3, the U.S. Treasury may be left with only incoming taxes and fees to cover expenses, which would not be enough to pay all bills. Mandel Ngan/AFP/Getty Images hide caption

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Secretary Jack Lew in his office at the U.S. Department of the Treasury in Washington, D.C., on Wednesday. Ariel Zambelich/NPR hide caption

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Treasury Secretary Jacob Lew on Monday. Saul Loeb /AFP/Getty Images hide caption

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The House of Representatives (Jan. 3 file photo). Kevin Lamarque /Reuters /Landov hide caption

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No, this isn't worth $1 trillion. It's a commemorative coin minted in the U.K. in 2008. But some have suggested the president's image should be on it if he orders up a $1 trillion coin. Christopher Furlong/Getty Images hide caption

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