Comments by "retnavybrat" (@retnavybrat) on "Some White House advisers fear Trump's final days" video.
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The Senate itself can't overturn the election. This is what could happen, however:
If someone in Congress wants to challenge the legitimacy of a states' electors, he/she may do so, but that person must have someone from the opposite chamber sign off on it with her/him (e.g., if Senator X wants to challenge the electors from Georgia, a member of the House of Representatives must sign off on it with the Senator).
Once a state's electors are formally challenged, each chamber of Congress holds a brief (up to two hours) debate, then votes on whether or not to reject the contested electors. The catch, though, is that both the House and Senate must vote to reject the electors. If one chamber votes to reject and the other doesn't, then the electors must be accepted.
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