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"First and foremost, as I have been saying since I first announced my candidacy for president, America must fix its lax immigration system, which allows far too many dangerous, inadequately vetted people to access our country," Trump said in a statement.
He added that the suspect, identified as Akayed Ullah, had entered the country through "extended-family chain migration," a system the president is seeking to end that allows families to sponsor relatives to come to the United States.