WASHINGTON (AP) — Abandoning his threat to immediately seal the southern border, President Donald Trump warned instead on Thursday that he'd slap tariffs on cars coming to the U.S. from Mexico unless the Mexicans do more to stop the flow of migrants and drugs to the U.S.

In his latest backtrack in recent days, Trump told reporters he would try the "less drastic measure" before resorting to his standing border-closure threat.

"Mexico understands that we're going to close the border or I'm going to tariff the cars. I'll do one or the other. And probably start off with the tariffs," Trump said. H...