WASHINGTON (AP) — In a rare confrontation, Republican senators declared deep opposition Tuesday to President Donald Trump's threatened tariffs on all goods coming into the U.S. from Mexico. But it's unclear they have the votes to stop him, and Trump said they'd be "foolish" to try.

All sides, including officials from Mexico meeting with Trump negotiators in Washington this week, remain hopeful that high-level talks will ease the president away from his threat. But with the tariffs set to start next Monday — and Trump declaring them "more likely" than not to take effect — fellow Republicans in...