Trump said the suspect's arrival in the USA through the extended "family-based chain migration was incompatible with national security" and pointed to his travel ban as a step forward in "securing our immigration system".
White House Press Secretary Sarah Huckabee Sanders told reporters Monday, "The president is aggressively going to continue to push forth responsible immigration reform, and ending chain migration would certainly be a part of that process". Sanders said the suspect was admitted through what is known as an F43 family immigrant visa, a type usually given to the children of siblings of US citizens.
He said the lax immigration system allows inadequately vetted people to access the United States.
Details on a possible motive were unclear, though analysts at the SITE Intelligence Group noted that the pro-ISIS Maqdisi media group suggested a link between the attack and President Trump's decision last week to recognize Jerusalem as the capital of Israel, The Washington Post reported.
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The nation's immigration system "allows far too many unsafe, inadequately vetted people to access our country", Trump said, adding that the family-based method that brought the suspect to the USA is "incompatible with national security".
Akayed Ullah, 27, is accused of detonating a pipe bomb taped to his stomach near the Port Authority's bus terminal, severely injuring himself and hurting three others in a crowd of early-morning commuters.
Ullah, as confirmed by the Department of Homeland Security (DHS), entered the U.S.in 2011 as a chain migrant. The countries include those with terrorist problems, including Afghanistan, Algeria, Egypt, Iraq, Lebanon, Libya, Nigeria, Saudi Arabia, Somalia, Syria, Trinidad and Tobago, Venezuela, Yemen, and Uzbekistan. "It would scrap our current family chain migration".
CNN reported that Sanders did not answer a follow-up question about whether Ullah had been "radicalized" while living in the USA, "as have recent terrorist attackers in the United States who were not natural born citizens". "The President's policy has called for an end to chain migration", she explained during her daily press briefing. Family connections, including spouses, children and extended family, account for a large share of green cards given out each year. David Perdue and supported by the White House, would limit the amount of extended family that can be sponsored for visas and was estimated to halve the amount of legal immigration from one million annually.