News that Betsy DeVos is advancing to her final confirmation vote to lead the Department of Education early next week has been met with pleas for one more “Republican with integrity” to step forward and reject the nominee.

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In what has emerged in the most contentious confirmation battle yet, Republican senators on Friday voted to cut off debate and advance the billionaire charter-school lobbyist to the next round.

“Senators convened at the unusual, early hour—6:30 a.m. ET—because of Democratic stalling tactics that reflect their unhappiness with Trump’s cabinet picks and the overall confirmation process,” CNN reported.

Responding to massive public opposition to the nominee, two GOP senators, Susan Collins of Maine and Lisa Murkowski of Alaska, announced this week they would not be supporting DeVos—joining Senate Democrats and Independents and bringing the total number of votes against her to 50. In the event of a tie, Vice President Mike Pence would be granted a deciding vote.

In turn, a handful of other Republicans deemed potential sway votes—such as Sens. Pat Toomey (Penn.), Dean Heller (Nev.), Jeff Flake (Ariz.), Deb Fischer (Neb.), and Rob Portman (Ohio)—have announced they will be supporting President Donald Trump’s nominee, which would elevate DeVos into a position for which critics say she is unqualified, and in control of a public education system which she has actively worked to undermine.

Reportedly, the billionaire heiress and GOP donor “is reaching out to lawmakers and has been told by 50 Republican senators that they will vote for her Monday,” her spokesperson Greg McNeilly told CNN on Friday.

However, the resistance remains undaunted. With a likely Senate vote planned for early next week, critics of DeVos are mounting a full court press on Republican lawmakers, particularly in rural states that have large bipartisan support for public schools.

According to the National Education Association, “senators have received more than 1 million emails and 50,000 phone calls opposing DeVos’s nomination.” Meanwhile, the American Federation of Teachers has vowed to lobby every senator who has not yet declared their support for or opposition to DeVos.