"From an economic standpoint, there are virtually no impacts other than positive ones for two industries that we need," the official said.
Outside of Washington, D.C., the view was much different.
"If the President wants to protect good-paying, family-supporting jobs in America, especially here in Wisconsin, then he should reconsider the administration's position on these tariffs," said Republican Gov. Scott Walker of Wisconsin.
"I believe it invites a trade war that ultimately will work against American jobs and consumers," said Gov. John Kasich of Ohio said of the tariff decision.
"Let's be clear: The President is proposing a massive tax increase on American families," said Sen. Ben Sasse (R-NE).
Farm groups were particularly alarmed by the President's move, worried that they will be targeted first by countries which object to the new tariffs.
"These tariffs are very likely to accelerate a tit-for-tat approach on trade, putting U.S. agricultural exports in the crosshairs,” said Brian Kuehl, Executive Director for the group Farmers for Free Trade.
There were already reports of other nations considering retaliatory trade measures; Canadian Prime Minister Justin Trudeau labeled the U.S. plan "absolutely unacceptable."
Meanwhile in Europe, there were reports that Kentucky bourbon, Harley Davidson motorcycles, and other items might be targeted with import duties as payback.
If that sounded like the start of a trade war, that kind of talk didn't phase top Trump advisers.
"All we're doing here is defending this country against a global economic trading environment that disadvantages" the United States, the White House official said to reporters, repeatedly saying the extra tariffs would have no negative impact in the U.S. on consumers, trade or jobs.
Earlier on Friday morning, the President had made clear he was following through on his campaign pledge to shake up the global trading system, saying "trade wars are good, and easy to win."