The president said US political leaders preceding him had allowed the decline of manufacturing in the nation, and cited a protectionist predecessor, President William McKinley, in defense of the tariffs.
Trump says he's sticking with his initial plan for import tariffs of 25 percent on steel and 10 percent on aluminum. Having overcome the opposition, Trump relished Thursday's signing ceremony, where he was flanked by steelworkers - some carrying their hard hats - who lavished praise on his decision.
Professor of public affairs at Pennsylvania's Franklin & Marshall College, Terry Madonna, said,"I would identify the support for Trump literally based on the backgrounds of a particular group of people here, and the same with OH and MI", he said.
Current and former White House officials often describe the president as being preoccupied with keeping campaign promises to his loyal supporters, even if those decisions are unpopular with a broader swath of Americans.
Trump has long threatened to pull out of the 24-year-old trade pact if it can't be overhauled and encourage manufacturers to bring factory jobs back the United States.
As the president dug in on his position, any potential compromise with foreign trading partners and Republican lawmakers was expected to still include some form of tariffs. Trump plans to campaign for Republican Rick Saccone on Saturday. A statement from Ways and Means chairman Kevin Brady applauded Trump for exempting Canada and Mexico, but reminds him that Congress "has constitutional authority over trade with foreign nations", even if that authority was previously ceded to the president. Having made little progress in Congress on several GOP priorities, Republican candidates have been banking on a strong economy and the growing popularity of the party's tax overhaul to combat a Democratic electorate energized by its disdain for Trump. "Going ahead, that could all be reversed with a trade war", Flake said.
Republican Sen. Ron Johnson of Wisconsin called the tariffs "a very risky action" that could put agricultural and manufacturing jobs in his state and across the country at risk.
Without disclosing the names of any other country that could hope for exemption, Sanders said: "That would be a case-by-case and country-by-country basis, but it would be determined whether or not there is a national security exemption".
Ryan is trying to persuade voters to elect Republicans and allow the party to keep control of the House by highlighting the GOP's successful drive to cut taxes for corporations and many individuals.
"I disagree with this action and fear its unintended consequences".
More than 100 House Republicans wrote Trump on Wednesday, asking him to reconsider "the idea of broad tariffs to avoid unintended negative consequences" to the USA economy and workers. The prices of a host of products made from steel and aluminum are expected to rise, and several countries have already threatened to impose their own tariffs on USA goods in retaliation.
Lawmakers from both parties said Trump's action on trade would hurt the economy and increase prices for consumers and businesses.
Trump also suggested Australia and "other countries" might be spared.