Donald Trump promised a room full of business leaders he would cut taxes and roll back regulations, but they also laughed at one of his proposals. Sources who attended the meeting Thursday in Washington, D.C., told CNBC that the presumptive Republican presidential nominee told the CEOs gathered at Business Roundtable’s quarterly meeting that, if re-elected, he would cut income taxes and restore the economic policies he pursued in his first term. “We’re going to give you more of the same for the next four years,” Trump said, according to a person who was in the room. Want more breaking politica…