PHOENIX (AP) -- Health and Human Services Secretary Kathleen Sebelius was in Phoenix on Thursday amid calls for her resignation.
The controversy is over the clunky rollout of insurance exchanges under President Barack Obama's health care law.
The former Kansas governor is the Obama administration's public point person on the health law's implementation.
Computer problems have kept many consumers from signing up through new online markets.
Sebelius says they're working 24-7 to make the federal website better, nobody has been fired over technical glitches and a lot of the problems were caused by a surge in demand.
She says she doesn't work for the people calling for her to step down.
Sebelius toured a Phoenix HHS call center and talk with "navigators" who have been trained to educate people about enrolling for coverage.