Noem says DHS can 'always do better' when pressed on agency's 'mistakes' before Homan's deployment

"We will continue to do our work, and this job is an honor to do. I'm very blessed that I get the chance to lead the department," she said, responding to the criticism on Sunday.

"It's an important position to protect our homeland and to make sure that these agencies are responding to people, that we're stopping terrorists and criminals from harming the American people. I always tell people that the days that you don't hear about us are the days that we were successful, because that meant that we stopped so many dangerous people from perpetuating violence and have gotten those terrorist threats and criminals out of our country before they had the chance to do something that would have devastated families."

Despite calls for Noem's removal by Democrats, Trump has praised her performance in the role.

"I think she's doing a very good job," he recently told reporters.

Fox News' Anders Hagstrom and Emma Colton contributed to this report.