Treasury pick makes promises.

Appearing on the business cable channel CNBC, Steven Mnuchin, Mr. Trump’s pick for Treasury secretary, made a series of promises and pledges sure to be remembered in the years to come:

■ Mr. Trump’s tax cuts will be huge, with the corporate tax rate dropping to 15 percent from 35 percent. Mr. Mnuchin said:

“This will be the largest tax change since Reagan. ... We’re going to cut corporate taxes, which will bring huge amounts of jobs back to the United States. We’re going to get to 15 percent, and we’re going to bring a lot of cash back to the U.S.”

■ But it will provide no net benefit to the rich.

“There will be a big tax cut for the middle class. Any tax cuts for the upper class will be offset by less deductions that pay for it.”

Details? Not many, but he did hint that he will push to cap the mortgage deduction for mega-mansions and second homes.

■ The Trump administration expects sustained economic growth of 3 percent to 4 percent a year. “That is absolutely critical for the country,” Mr. Mnuchin said.

Critical, perhaps, but difficult, considering the United States has not seen consistent growth like that since the 1990s.

■ The Trump administration will label China a currency manipulator “if we determine” that’s warranted.