Education Secretary Betsy DeVos gave a stumbling, cringeworthy interview to CBS's "60 Minutes" in which she said she didn't know whether her policies had helped struggling public schools.

DeVos, a controversial Cabinet pick for President Donald Trump, advocates increasing school choices rather than investing more in existing schools.

DeVos commented on sexual assault within education, a proposal to arm teachers to prevent school shootings, and the status of schools in her home state of Michigan.

Education Secretary Betsy DeVos, the billionaire school-choice advocate who became the first presidential Cabinet member to require the vice president's tie-breaking vote during a Senate confirmation, gave a stumbling, cringeworthy interview to CBS's "60 Minutes" over the weekend.

Grilled by CBS's Lesley Stahl, DeVos clung to a belief that creating more schooling options for families is more beneficial than spending money to improve existing public schools.

In a wide-ranging interview that touched on many key education issues, DeVos said that arming teachers "should be an option," that billions of dollars in investments in public schools had produced "zero results," and that she didn't know whether the number of false rape accusations on college campuses in the US matched the number of sexual assaults.

But the tensest exchange came when Stahl pressed DeVos on her support for public schools.

Asked whether cutting funds for struggling public schools would improve them, DeVos dodged.

"Well, we should be funding and investing in students, not in school buildings, not in institutions, not in systems," she said.

Then asked whether public schools in Michigan — DeVos' home state that has long advocated school choice — had improved, she said she did not know.

"I can't say overall that they have all gotten better," said DeVos, who later, at Stahl's prompting, agreed that maybe she should visit some of the struggling schools there.

Watch a clip of the tense exchange: