WASHINGTON — The head of the agency responsible for airport security, facing protests from travelers and pressure from the White House, appeared to give ground Sunday on his position that there would be no change in policies regarding invasive passenger screening procedures.

Transportation Security Administration head John Pistole said in a statement that the agency would work to make screening methods “as minimally invasive as possible,” although he gave no indication that screening changes were imminent.

The statement came just hours after Pistole, in a TV interview, said that while the full-body scans and pat-downs could be intrusive and uncomfortable, the high threat level required their use. “No, we’re not changing the policies,” he told CNN’s “State of the Union.”

Pistole said that, as in all nationwide security programs, “there is a continual process of refinement and adjustment to ensure that best practices are applied.”