The dollar fell against a broad swathe of currencies on Wednesday, undermined by worries about the Trump administration's tax cut and spending bill, as well as a weak 20-year Treasury bond sale that reinforced a growing view that investors are shying away from U.

Stock markets were mostly down and the dollar continued to fall as concerns persisted over U.S. government debt.

A bond sell-off and declining dollar signalled investor unease Wednesday as Washington lawmakers contemplated a tax-cut bill that could push up the US deficit.