"With an Administration that seems more intent on responding to the interests of the world than the needs of the American people — Congress has an obligation to be vocal and, if necessary, resist this effort," Cruz wrote in a letter Wednesday to Department of Homeland Security Secretary Jeh Johnson, Secretary of State John Kerry, Attorney General Loretta Lynch and FBI Director James Comey.
His letter comes as the White House is pledging to increase the number of Syrian refugees allowed into the United States.
Cruz wants the administration to hand over a "detailed description" of how it vets Syrian refugees seeking to enter the United States, including anti-terrorism and criminal databases checked and how the administration ensures Syrian refugees aren't terrorists, as well as what steps it takes to apprehend Syrian refugees wanting to enter the United States if they are suspected of terrorist or criminal activity.
Cruz's letter comes as lawmakers are struggling to determine what Congress should do to counter Syria's humanitarian crisis. While some Republican lawmakers have tentatively backed the administration's plan to allow more refugees into the country, they have also — like Cruz — raised concerns about national security.
Cruz wants the departments to preserve any documents or communications from Oct. 1, 2013, and onward that are related to John Allen, the envoy for the global coalition to combat ISIS, or any personnel involved in the effort; that mention the conflicts in Iraq and Syria; that mention refugees from the Middle East, Africa or Central Asia; or that mention one of the handful of names and acronyms for ISIS.