President-elect Donald Trump has named Betsy DeVos, a conservative activist and billionaire philanthropist who has pushed forcefully for private school voucher programs nationwide, as his nominee for education secretary.

Trump’s pick underlines his promises on the campaign trail to put “school choice” — the expansion of taxpayer-funded charter schools and vouchers for private and religious schools — at the center of his efforts on education.

His embrace of DeVos, a Michigan power broker and major donor to the GOP and its candidates around the country, shows a willingness to look outside his circle of loyalists. DeVos donated money to Republican primary contenders Carly Fiorina and Jeb Bush before throwing her support behind Sen. Marco Rubio (R-Fla.). She was never an enthusiastic Trump supporter, telling the Washington Examiner in March that she considered him an “interloper” who “does not represent the Republican Party.”

She had warmer words for Trump on Wednesday. “I am honored to work with the President-elect on his vision to make American education great again. The status quo in ed is not acceptable,” DeVos tweeted Wednesday afternoon, before any official announcement was made. “Together, we can work to make transformational change to ensure every student has the opportunity to fulfill his or her highest potential.”