Why didn't the Republicans pass "tax reform" during the 8 years under Obama.
After all the Republicans controlled both the House from 2011 to present and the Senate from 2015 to the present.  The Republicans have controlled both House and Senate since 2015. 
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Tell me what happened to the deficit during the Trickle Down "Tax Reforms" of Ronald Reagan, George H.W. Bush, and George W. Bush. 
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As for Obama "Tax Reform", read your history, then get back.