1. Senate Republicans sent President Trump a sharp message: They are prepared to overturn his tariffs on Mexican imports.

The rebuke came hours after the president affirmed his pledge to impose tariffs on Mexico next week, for items like avocados, and said the senators would be “foolish” to try to stop him.

Mr. Trump’s latest threat — 5 percent tariffs on all goods until the Mexican government stems the flow of migrants — has riled Republican senators who fear its impact on the economy and their home states.