WASHINGTON (AP) — With President Donald Trump’s dramatic tariff hikes on the cusp of starting, countries around the world scrambled on Thursday to finalize their trade frameworks with the United States, figure out the tax rates their goods might face and prepare for the unknown.

Shortly before Friday deadline for the tariffs beginning, Trump said he would enter into a 90-day negotiating period with Mexico, one of the nation’s largest trading partners, with the current 25% tariff rates staying in place, down from the 30% he had threatened earlier.

“We avoided the tariff increase announced for tomorrow and we got 90 days to build a long-term agreement through dialogue,” Mexican leader Claudia Sheinbaum wrote on X after a call with Trump that he referred to as “very successful” in terms of the leaders getting to know each other better.

White House press secretary Karoline Leavitt said at Thursday’s news briefing that Trump “at some point this afternoon or later this evening” would sign an order to impose new rates starting at 12:01 a.m. EDT Friday. Countries that had not received a prior letter from Trump or negotiated a framework would be notified of their likely tariff rates, either by letter or executive order, she said.