FILE- In this Dec. 11, 2017, file photo, U.S. Senate candidate Roy Moore speaks at a campaign rally in Midland City, Ala. Moore is going to court to try to stop Alabama from certifying Democrat Doug Jones as the winner of the U.S. Senate race. Moore filed a lawsuit Wednesday evening, Dec. 27, 2017, in Montgomery Circuit Court. (AP Photo/Brynn Anderson, File)
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Refusing to concede, failed candidate Roy Moore has doubled down on his claims of voter irregularities in Alabama's U.S. Senate race in a last-ditch effort to stop the certification of the Democratic opponent who pulled off a historic upset last month in a traditionally deep-red state.