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Catherine Rampell: Duh, we need to see Trump’s tax returns. But that’s just the first step.

This March 22, 2013 file photo shows the exterior of the Internal Revenue Service (IRS) building in Washington.   (AP Photo/Susan Walsh, File)

This March 22, 2013 file photo shows the exterior of the Internal Revenue Service (IRS) building in Washington. (AP Photo/Susan Walsh, File)