United States tariffs on Mexican and Canadian imports took effect on Tuesday. The levies, set at 25 percent by US President Donald Trump, have been followed by the doubling of duties on Chinese goods to 20 percent.

President Donald Trump reversed course on Tuesday afternoon on a pledge to double tariffs on steel and aluminum from Canada to 50%, just hours after announcing the higher tariffs, in rapid-fire moves that scrambled financial markets.

One Democratic senator offered an unexpected example of how he says President Donald Trump’s tariffs would hurt farmers and small businesses in his home state and across the country: Canadian-made aluminum pie pans.