President Donald Trump pitched his tax reform plan during a keynote address at the Heritage Foundation’s annual President’s Club meeting on Tuesday evening in Washington, D.C.

“Let’s give our country the best Christmas present of all—massive tax relief,” Trump said. “And speaking of Christmas, I’ll give you a bigger Christmas present, we’re going to be saying Merry Christmas again.”

Calling it a once-in-a-generation opportunity, the president touted his administration’s tax reform plan as the “biggest reduction in taxes in the history of the country.”

Trump said the plan saves the average American family $4,000. He also pushed for increasing the child tax credit, simplifying the tax code, and cutting the business tax rate, which he called a “self-inflicted economic wound.”