“Just as I promised the American People from this podium 11 months ago, we enacted the biggest tax cuts and reform in American history,” Trump said.

This claim is false. The GOP tax bill, passed in December, does not amount to the "biggest" in U.S. history, according to the non-partisan Committee for a Responsible Federal Budget. According to their estimates, Trump's tax cut is the eighth biggest in history.

As for the reform aspect: "It’s hard to mathematically measure how reform-y your tax plan is," said Kyle Pomerleau, the director of federal projects at The Tax Foundation, an independent tax policy think tank. Still, Ronald Reagan's 1986 reform simplified the tax code in a big way and was probably more "reformish," Pomerleau told NBC News.