From September 11, 2001, when hijackers directed suicide strikes at York and Washington, until last month, 549 people were convicted of "international terrorism-related charges" in federal courts, Homeland Security said.
"This report reveals an indisputable sobering reality-our immigration system has undermined our national security and public safety", Attorney General Sessions said in the report. The data he cited - originally collected by then-Senator Sessions and presumably the basis for parts of this new report - included four terrorists who came to the U.S. to face trial. It ignores domestic terrorism, focusing only on worldwide terrorism. In recent years, many worldwide terrorism charges stem from attempts to join or provide material support to ISIS.
By including only those convicted in federal courts, the government's new report excludes well known examples of deadly terrorist attackers who were natural born American citizens, such as Carlos Bledsoe, who killed a soldier in an attack on a military recruiting station in Little Rock, Arkansas in 2009 and was charged in state court.
Mahmoud Amin Mohamed Elhassan, a national of Sudan, was admitted to the United States in 2012 as a family member of a lawful permanent resident from Sudan, according to the report.
"The report lumps U.S. citizens and non-citizens together as "foreign-born". Those included Nader Elhuzayel, a naturalized citizen who kept a hit list of Defense Department employees and planned to travel overseas to join ISIS before his arrest.
Each year, the lottery gives 50,000 green cards to nationals of countries that had a low immigration rate to the United States in the previous five years.
The report specifically highlights convicted worldwide terrorists who were admitted to the United States by the diversity visa lottery or by chain migration, policies the White House has highlighted as objectionable in its immigration reform efforts.
Among those terrorists, although not included in the report due to the date of his crime, is Times Square truck attacker Sayfullo Saipov, an admit of the diversity visa lottery program who killed eight in November.
As the furor continues over President Donald Trump's reportedly vulgar remarks on immigration, the White House added a new element to the public debate over who should be allowed into the United States.
"There were 549 individuals convicted of global terrorism-related offenses in US federal court".
-The Department of Homeland Security encountered 2,554 individuals on the terrorist watch list traveling inside the United States during fiscal year 2017, which began October 1, 2016. 335 of those were attempting to enter by land, 2,170 by air, and 49 by sea.
-From 2010 through 2016, Customs and Border Protection identified and prevented the boarding of 73,261 foreign travelers on flights destined for the US because they posed a risk.
Those statistics also included information about illegal aliens deported by the Immigration and Customs Enforcement agency (ICE), which has removed 1,716 people since September 11, 2001, due to national security concerns.
Trump touted it via Twitter, tying it to the immigration fight.
Cabinet-level officials saw the conclusions of the report as evidence that the United States' current immigration regime was inadequate to ensure national security.
Testifying on Capitol Hill, Kirstjen Nielsen, the homeland security secretary, called the report's findings "truly chilling data".
Noting the number of naturalized citizens who become radicalized on the list in the Justice and Homeland Security report, Inserra said the bigger problem is with assimilation. "We have submitted to Congress a list of resources and reforms. we need to keep America safe, including moving away from a random chain migration and lottery system, to one that is merit-based", the President tweeted.