The euro briefly hit a three-week low on Monday before partially recovering, while the dollar held steady in a muted reaction to U.S. President Donald Trump's threat to impose a 30% tariff on imports from two of the largest U.

Something different just happened to the U.S. dollar, which recently completed its worst first half of any calendar year since at least the 1970s: The dollar strengthened this week, despite President Donald Trump’s ongoing tariff talk.