President-elect Donald Trump has picked billionaire Betsy DeVos, a Michigan Republican activist and philanthropist who is a strong supporter of school choice but has little experience with public education, as his secretary of education.

DeVos, 58, is a former chairwoman of the Michigan Republican Party and helped push a failed 2000 ballot proposal to amend the Michigan state Constitution to create a voucher system for students to attend nonpublic schools.

DeVos is chairman of The Windquest Group, a Michigan-based investment management company. She is married to billionaire Richard DeVos Jr., the son of Richard DeVos, who co-founded the home care products companyAmway.

Trump, in a statement, called DeVos "a brilliant and passionate education advocate." He added that she would have the leadership ability to "break the bureaucracy that is holding our children back."

Largely unknown outside of Michigan political and philanthropic circles, her appointment signals that Trump intends to make school choice anda voucher plan for low-income families a centerpiece of his education agenda.

School choice plans are controversial because in some cases they can allow families to use public funding for private schools. Critics say choice plans are often underregulated and can amount to profiteering.

Not surprisingly, Trump's selection of DeVos as his education secretary drew swift reaction from the head of the nation's largest teachers union.

Lily Eskelsen García, the president of the National Education Association, slammed the choice, saying it would undermine public education. DeVos "has consistently pushed a corporate agenda to privatize, de-professionalize and impose cookie-cutter solutions to public education," Eskelsen Garcia said in a statement. "By nominating Betsy DeVos, the Trump administration has demonstrated just how out of touch it is with what works best for students, parents, educators and communities."

DeVos currently chairs the board of theAmerican Federation for Children, a group that according to its website works to provide families "with access to great schools through private school choice." Her children attended private Christian schools. She also sits on the board of theGreat Lakes Education Project, a pro-charter school lobbying group in Michigan.

DeVos has helped make Michigan's charter schoolsamong the least regulated in the nation. Some 80 percent of the state's charters are run by private companies.

Trump has voiced strong support for school choice and charters. But otherwise DeVos would seem an unorthodox choice: She is not a Trump loyalist and has voiced support for Common Core State Standards,which Trump opposes. She has limited experience grappling with national education policy, public education or running a large federal bureaucracy.

DeVos actively campaigned for Trump's rivals during the Republican primaries. DeVos backed Jeb Bush and later Marco Rubio and John Kasich. She did not actively support Trump after he won the nomination.

In March,she told the Washington Examiner, "I don't think Donald Trump represents the Republican Party. I continue to be very optimistic that as we get further along into the process, the more voters know about him, and the more informed they are, the more they're going to continue to break away."

Some Trump backers are alarmed at the pick because DeVos also sits on the board of theFoundation for Excellence in Education, a group founded by Jeb Bush to promote choice and the Common Core.

Getting rid of those standards in math and English is one of the few education issues Trump mentioned during the campaign. The president and Department of Education, however, have no formal authority to undo those state-level academic standards. But backers want him to incentivize states to replace the Common Core.

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