The stakes are high as the most chaotic US presidential election in memory collides with a once-¬in-a-century pandemic, which has led 20 states to expand or ease access to voting by mail as a public health measure. Election experts said that the combination of the hotly contested White House race and millions of first-time mail voters could lead to a record number of ballot rejections and trigger a searing legal war over which are valid — and who is the ultimate victor.

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