BALTIMORE (AP) — A botched suicide mission on the New York City subway system showed in the “starkest terms” that the failures of the U.S. immigration system are a national security issue, U.S. Attorney General Jeff Sessions said Tuesday during a stop in Baltimore with the new Homeland Security chief.Speaking at a news conference at the U.S. Attorney’s office in Baltimore, Sessions said two terrorist incidents in New York in the last two months were each carried out by men who were in the U.S. “as a result of failed immigration policies.”A 27-year-old Bangladeshi immigrant is in custody after Monday’s rush hour attack in New York. Authorities said Akayed Ullah came to the U.S. in 2011 on a visa available to certain relatives of U.S. citizens. An earlier truck attack Oct. 31 on a bike path near the World Trade Center, authorities said, was carried out by an Uzbek immigrant.Homeland Security Secretary Kirstjen Nielsen, the former deputy White House chief of staff confirmed last week by the Senate, said “while we are not aware of any specific credible threats today we are taking additional security precautions and assessing what other security enhancements” could be put in place.Sessions called anew on Congress to strengthen immigration laws and said President Donald Trump’s administration was moving to more strictly enforce immigration law and reduce an immigration caseload that has tripled since fiscal 2009.