Treasury Secretary Steven Mnuchin said on Thursday the Trump administration’s goal in tax reform is a middle-class tax cut, but he couldn’t guarantee one.“That’s our objective, absolutely,” Mnuchin told ABC’s George Stephanopoulos on "Good Morning America." “I can’t make any guarantees until this is done and on the president’s desk.”“Although we’re not releasing the specific numbers,” as what the administration wants to do to the tax code that would help middle-class Americans, Mnuchin said.