Donald Trump outlined his economic vision in a crucial speech Monday, raising his proposed top income tax rate to 33 percent and expanding on some reforms he has struggled to pin down consistently as a presidential candidate.

In the biggest shift from his past plans, Trump said he would seek three income tax brackets of 33 percent, 25 percent and 12 percent, but did not outline which income levels would pay each rate. He previously sought a top rate of 25 percent versus the current rate of nearly 40 percent.