What Trump ultimately decides to announce on tariffs will be “effective immediately,” White House press secretary Karoline Leavitt said Tuesday. That is logistically dubious, but if that is the case, other nations would have little time to negotiate and could respond by immediately imposing countermeasures such as retaliatory tariffs.

President Trump, accusing "friend and foe alike" of taking advantage of the United States on trade issues, said he would impose reciprocal tariffs on countries all over the world.