Passengers at O'Hare International Airport wait in line to be screened at a Transportation Security Administration (TSA) checkpoint on May 16, 2016 in Chicago, Ill. (Photo by Scott Olson/Getty)

Will long airport lines end?

Amid fierce criticism over long lines at airports, TSA Administrator Peter Neffenger defended his agency — but also suggested the delays may continue through the summer — during an exclusive interview with TODAY's Matt Lauer and Savannah Guthrie.