President Donald Trump signed an order to put tariffs on U.S. neighbors Canada and Mexico, as well as China, starting Tuesday.

Trump signed an executive order to implement tariffs on Mexico, Canada, and China.He has been threatening the tariffs on the three countries and others for months.Canada and Mexico have vowed to impose retaliatory tariffs against the US.

China chose swift retaliation for trade measures in the first Trump administration, but that led to an upward spiral of trade measures and much broader tariffs.