On the flipside, left-leaning groups and individuals praised the plan as beneficial to United States workers.
The US leader has triggered howls of protest in his own camp by slapping tariffs of 25 percent on imports of steel and 10 percent on aluminum on Thursday, with only Canada and Mexico exempt for the time being.
Johnson said he expected Trump's action, which takes effect in 15 days, to be challenged in court.
"Tariffs are a tax increase on American workers and their families", said Heritage President Kay Coles James in a statement shortly after Trump signed the order.
Tim Phillips, the president of Americans for Prosperity, also condemned the tariffs as "disappointing" and a threat to the economy. He said he plans legislation that would nullify them.
"If there's a trade war and in response, tariffs are raised, that could even push down our supply in steel because it pushes down the demand", Professor Dempsey added.
The latest version of this law, adopted under Barack Obama in 2015, will expire in July of this year unless Trump requests an extension until 2021. "These could be a lethal blow to all the economic success this administration has ushered in".
"Tariffs won't start a trade war, there's 435 of them in place today to fight trade cheaters", wrote top union boss and AFL-CIO President Richard Trumka.
"I generally support the president on just about everything, but I think he's been misled, there are some people down there who have been misleading him on some of these things", Hatch continued. And, you know, when we only represent just over 20 percent of the world's economy, only 5 percent of the world's population, if we don't trade, we don't grow. "Targeted tariffs are the best way to start fighting back and hold cheaters accountable".
Tillerson seeks neutral site for Trump-Kim talks
Kim may offer to give up his nukes for USA forces' pullout from South Korea and a signed peace treaty. Meanwhile, the Trump administration is continuing to prepare on a number of levels for the meeting.
Mizzou Basketball's Jordan Barnett Arrested for DUI
Barnett was arrested Saturday morning in Columbia, Mo ., and was cited for failure to drive in a single lane and suspicion of DWI. The victor of that game will likely play No. 1 Xavier on Sunday. "He's suspended right now, as we speak", Martin said.
Business Report: What happens if Trump does steel tariffs
On Friday, he tweeted that " trade wars are good and easy to win" - one of his most ridiculous tweets ever, which is saying a lot. President Donald Trump is prepared to do in the name of so-called "winning". "Millions of people addicted and dying", he said .