India, Dec. 4 -- A former senior USCIS official has revealed that the agency's newly announced review of green card and other immigration applications could lead to massive delays. It could also place a huge strain on resources.

This comes after a shooting in Washington, DC, killed West Virginia National Guard Specialist Sarah Beckstrom, and wounded West Virginia Air National Guard Andrew Wolfe. The shooting was carried out by Afghan national Rahmanullah Lakanwal, who was shot by another Guard member and taken into custody.

Ricky Murray, who was chief of staff of Refugee and International Operations at USCIS until November 29, told Newsweek that the effort was unprecedented in scope. "This is going to have a tremendous effect on the bac...