First lady Melania Trump’s office is rescheduling Saturday’s White House spring garden tours over concerns about nationwide protests. More than 1,100 “Hands Off!” rallies are being held across the country to protest President Donald Trump’s political,

But then financial journalist James Surowiecki concluded that Trump’s retaliatory tariffs were based on a simple formula: a country’s trade deficit, divided by the country’s exports to the United States.

It comes a day after Trump announced far-reaching new tariffs on nearly all U.S. trading partners — a 34% tax on imports from China and 20% on the European Union, among others — that threaten to dismantle much of the architecture of the global economy and trigger broader trade wars.