Trump's critics have frequently called out his statements concerning historical events, including vaguely worded praise for Frederick Douglass that implied the abolitionist was still alive, a view that Napoleon was defeated by Russian Federation "because he had extracurricular activities", and his opinion that if Andrew Jackson had been born later, "you wouldn't have had the Civil War".
The global trade system "is a mess".
"Simply put, Trump no longer sees the necessity of keeping allies happy at the expense of the American people, so he's trying to solve the free-rider problem", Schweller, a political science professor at Ohio State University, said in an email.
Trump does not intend to withdraw from NAFTA, National Economic Council Director Larry Kudlow said on "Fox & Friends".
Trump announced in March that he was imposing tariffs on imports of steel and aluminum, but he temporarily granted a waiver to U.S allies like Canada, Mexico and the European Union, and also to China, as his administration said trade talks were continuing.
Trump is expected to attend the Group of Seven summit on Friday and Saturday with the leaders of the world's largest economies before flying to Singapore for a historic meeting with North Korean leader Kim Jong Un on June 12.
Mexico said it would impose import duties on $3 billion worth of USA products, including cheese, bourbon, pork and others, making good on its threats that it would retailiate for US tariffs on steel and aluminum.
But officials from the three countries have been unable to find consensus on several critical issues, leading to finger-pointing between Trump and Canadian Prime Minister Justin Trudeau in recent days.
Trudeau told NBC: "The idea that we are somehow a national security threat to the United States is, quite frankly, insulting and unacceptable".
When President Donald Trump arrives in Canada this week for a summit of the Group of Seven industrialized nations, he is expected to seek what he considers a better deal for us workers rather than worry about America's leadership role in the world.
The move has also dismayed some domestic businesses, including pork producers, who now face a 20% tariff on exporting leg and shoulder to Mexico.
Mexico is a huge importer of American pork.
After increasing pressure from the Mexican government, the Obama administration eventually relented and changed rules to allow Mexican truckers to enter the USA more efficiently.
"The United States now has the fastest growing economy in the world, according to the OECD or at least the fastest growing economy among the industrialized nations", said Kudlow, who worked as Reagan's budget deputy between 1981 and 1985.
In its announcement, the Mexican government said "it is necessary and urgent to impose measures equivalent to the measures implemented by" U.S. to protect Mexican industries.
"Some said it couldn't be done".
Chinese officials have indicated the nation is open to buying as much as US$70 billion in USA exports, the people said. The policies are working.
"We know it works, we know it underpins a very integrated supply chain".
Kudlow denied another element of the Washington Post report: that Treasury Secretary Steven Mnuchin had advocated a softer approach toward Canada, including an exemption from the metals tariffs.
"The world trading system has got to be fixed and if nothing else, the USA has to be protected", he said. "Record Jobs numbers. Nice!"