President Donald Trump made good on his promise to impose steep tariffs on America’s three largest trading partners — Canada, China and Mexico — citing a national emergency on the flow of fentanyl and undocumented immigrants into the United States.

Trump discussed the tariffs in a series of posts on his social media platform, Truth Social. One update announced the official orders of the tariffs, stating that the decision was made to “protect” Americans “because of the major threat of illegal aliens and deadly drugs killing our Citizens, including fentanyl.”