Full agreements have yet to be reached with the U.S.’s three largest trading partners, Canada, China and Mexico; some Canadian imports have been subject to a 35 percent tariff since early August.

President Donald Trump’s trade war with the world came into force at midnight, with sweeping tariffs hitting scores of America’s commercial partners. But what happens next is profoundly unclear. The two critical questions: Are the tariffs working?

President Trump's latest round of tariffs are now in effect, and the president is promising even more tariffs on countries that are helping to fuel Russia's war with Ukraine. Erica Brown reports from the White House.