It's called negotiation
“I am pleased to inform you that The United States of America has reached a signed agreement with Mexico,” Trump tweeted June 7, 2019. “The Tariffs scheduled to be implemented by the U.S. on Monday, against Mexico, are hereby indefinitely suspended. Mexico, in turn, has agreed to take strong measures to stem the tide of Migration through Mexico, and to our Southern Border.” Mexico reportedly said it would send 6,000 National Guard troops to the southern border to halt further illegal migration. By June 14, 2019, thousands of Mexican National Guard members were sent to the border with Guatemala.