If all other GOP senators support DeVos as expected, and all Democrats oppose her, she would end up with a 50-50 vote in the Senate and Vice President Mike Pence would have to break the tie to confirm her.
"While I share numerous concerns of Senator Murkowski, after meeting with Mrs. DeVos, she committed to me that she will work with all Alaskans to strengthen education throughout the state, in both public and private schools", Sullivan said.
If all 48 Senate Democrats vote against DeVos, plus the two Independents who caucus with them, the vote could be split in a 50-50 tie.
The White House was unconcerned, with press secretary Sean Spicer saying they are still convinced Mrs. DeVos will be approved.
"I was pleased to see she came out so strongly".
Sen. Lamar Alexander of Tennessee, the Republican chairman of the Health, Education, Labor and Pensions Committee, praised DeVos and expressed confidence that she would be confirmed.
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"Ms. DeVos is committed to those principles and Sen".
"Betsy DeVos is not qualified, and even more than unqualified, Betsy DeVos is an actual danger to students - especially our most vulnerable students", National Education Association President Lily Eskelsen Garcia told The Washington Post.
Alaska's other senator, Republican Dan Sullivan, issued a statement of support for DeVos later Wednesday. Critics have said vouchers would privatize public education and violate the separation of church and state if more public money went to religious schools. Her decision follows intense pressure from her constituents, who have flooded her office with emails, calls and visitors. One more "no" vote would likely tank DeVos' nomination.
The public outcry against DeVos was swift, with Democrats and education advocates launching a mass effort to sway senators to vote against her confirmation.
Critics have questioned DeVos' grasp of overall education policy, as well as her emphasis on using school choice to help students in struggling areas.