TSA officers need a 'skilled eye.' ICE's presence is raising concerns.

As ICE officers were deployed to airports, some have raised concerns about their qualifications.

Immigration and Customs Enforcement officers were deployed to airports across the country this week, aiming to alleviate long security lines amid a partial government shutdown.

Transportation Security Administration worker absences reached their highest levels over the weekend since the shutdown began in mid-February, and the White House said on March 22 that more than 400 officers had quit. ICE was sent to more than a dozen airports, including major travel hubs like New York’s John F. Kennedy International Airport (JFK) and Hartsfield-Jackson Atlanta International Airport (ATL), CNN reported.

DHS Acting Assistant Secretary for Public Affairs, Lauren Bis, declined to confirm to USA TODAY where ICE agents had been deployed, citing "operational security reasons."

However, some have raised concerns about ICE officers’ qualifications. TSA officers – who have been going without regular pay – receive specialized training and their duties differ significantly from those of ICE employees. Here's what it would take for ICE officers to perform TSA duties.

TSOs, or transportation security officers, who operate screening equipment to scan for dangerous objects, perform searches, control terminal entry points and exits and other duties, undergo in-depth training.