WASHINGTON — The White House said Tuesday night that President Trump planned to deploy the National Guard to the southern border to confront what it called a growing threat of illegal immigrants, drugs and crime from Central America after the president for the third consecutive day warned about the looming dangers of unchecked immigration.

Mr. Trump’s advisers said Monday that he was readying new legislation to block migrants and asylum seekers, including young unaccompanied children, from entering the United States, opening a new front in the immigration crackdown that he has pressed since taking office. But in remarks on Tuesday that caught some of his top advisers by surprise, he suggested the more drastic approach of sending in the military to do what immigration authorities could not…

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