But as Secretary of State Rex W. Tillerson arrived in Mexico on Wednesday, twin threats hung over the frayed relationship between the two nations: President Trump’s new orders to round up<br />and deport immigrants who are in the United States illegally, and a separate effort to take a hard look at all American aid to Mexico, possibly using it to pay for a border wall instead.<br />At an event in Mexico City on Wednesday, Mr. Videgaray said, “I want to make clear, and in the most emphatic way,<br />that the Mexican government and the Mexican people do not have to accept orders that a government seeks to impose unilaterally on another.”<br />That threat to saddle Mexico with other countries’ migrants is one reason Mexican officials could<br />emerge from their meetings this week deciding to fight rather than appease the Americans.<br />Mr. Tillerson, the top American official to visit Mexico since Mr. Trump’s inauguration, arrived with John F. Kelly, the secretary of Homeland<br />Security, only a day after the Trump administration released documents ordering a crackdown on immigration in the United States.<br />By Friday, American officials are required to finish calculating all the money and grants<br />that the United States provides to Mexico, a task that Mr. Trump first demanded in the executive order he signed last month directing the construction of a border wall.<br />The Trump administration also said it planned to detain non-Mexicans who had crossed the southwest border with the United States<br />and send them back to Mexico to await the outcome of their deportation proceedings.<br />Though American officials said that this measure would be done only after discussions with the Mexican government, Mexican officials<br />and legal experts rejected the idea as a violation of Mexican law and international accords.
