The Trump administration argues that migrants stopped on the Mexican side of the southern border have not "arrived in the U.S." and therefore have no right to seek legal protection on American soil. Immigrant advocacy groups challenging the Trump policy insist that blocking asylum seekers is plainly against the law.

The president says that he “probably would talk to” Venezuelan President Nicolás Maduro, but underscores that he is not taking off the table the possibility of military action on Venezuelan territory.

For months, the United States has been building up its military presence in the Caribbean, and the administration has said the military campaign is primarily about stopping the flow of drugs in the re...