The US Department of Homeland Security recently released a study on the link between immigration and terrorism. The report, issued on Tuesday, said about 73 percent of the 549 individuals convicted of 'international terrorism-related' charges in US federal courts between Sept. 11, 2001, and Dec. 31, 2016, were born outside the United States. In a briefing call with reporters, a senior administration official pointed to the report as evidence that the United States needs to reform its immigration system, including to eliminate the diversity visa lottery and extended family-based immigration, in favor of high-skilled immigrants. But the official said the administration was not ready to release statistical information on the manner of entry of the individuals convicted.