Hundreds of educators, parents and students will congregate on Capitol Hill Monday evening to protest Betsy DeVos ahead of Tuesday's final vote to confirm President Trump’s Education secretary nominee.

Demonstrators will call on senators to oppose her nomination as Democrats seek a third Republican senator to defect and sink her chances.

Protesters, who plan to gather from 4:30 p.m. to 7 p.m., will be joined by a handful of senators as well as members of the American Federation of Teachers and National Education Association teachers unions, which have rallied against her nomination.

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The Monday protest coincides with a 24-hour talkathon planned by Senate Democrats to voice opposition to DeVos that's expected to last until Tuesday’s floor vote, scheduled for noon.

DeVos is a vocal advocate for charter schools and school choice, and her critics have sought to paint her as an opponent of public schools.

In a stunning move, GOP Sens. Lisa Murkowski Lisa Ann MurkowskiGOP ramps up attacks on Democrats over talk of nixing filibuster OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House Democrats tee up vote on climate-focused energy bill next week MORE (Alaska) and Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (Maine) broke with Republicans last week and announced they couldn’t support the billionaire GOP donor. DeVos needs a simple majority to be confirmed, and Republicans hold 52 seats in the Senate.

Democrats and progressive groups are now targeting a number of Republican senators who could be the third defection, but so far no others have announced opposition to her nomination.

If no other GOP senators defect, the vote will stand at 50-50, with Vice President Pence casting the historic tie-breaking vote. It will be the first time a vice president has ever been the deciding vote on a nominee.