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In this Aug. 1, 2017, file photo, packages riding on a belt are scanned to be loaded onto delivery trucks at the Amazon Fulfillment center in Robbinsville Township, New Jersey. (AP Photo / Julio Cortez, File)

The coming weeks will be the first test of whether they can make that happen during the busy holiday shopping season, when onslaughts of orders and bad weather can lay waste to even the best delivery plans.

In this Feb. 6, 2019 file photo, Supreme Court Chief Justice John Roberts answers questions during an appearance at Belmont University in Nashville, Tennessee. (AP Photo / Mark Humphrey)

While a Senate trial of President Donald Trump now appears inevitable, details of how it will unfold remain unknown. How long will proceedings last? Can either party summon witnesses to make its points? Senators will have to decide these and other, potentially thorny questions.

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