Senate Majority Leader Mitch McConnell (R-Ky.) on Nov. 9 threw his support behind President Trump’s legal challenges in the wake of his election loss. (Video: Reuters)

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Senate Majority Leader Mitch McConnell and other Republicans on Monday backed President Trump’s efforts to contest his loss to President-elect Joe Biden, despite the lack of evidence of significant fraud and sharp rebukes from election officials who defended the integrity of the vote.