Story highlights Betsy DeVos has come under fire from Democrats and two key Republicans

Senate Minority Leader Chuck Schumer implored senators to "look into their conscience"

(CNN) The Senate voted early Friday to advance President Donald Trump's education secretary nominee Betsy DeVos to a final confirmation vote, which is expected Monday.

The vote was 52 to 48 along party lines.

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.

DeVos has come under fire from Democrats and two key Republicans for her positions on public and charter schools, as well as statements made during her confirmation hearing last month.

Despite losing support from Republican Sens. Susan Collins of Maine and Lisa Murkowski of Alaska, she is expected to be confirmed Monday with the help of Vice President Mike Pence, who will be in the chamber to break an expected 50-50 tie.

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