Some states automatically launch a recount if the results are within a certain margin, while others rely on candidates to ask for one.
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Election Day is here. What happens next?
Follow NBC News' in-depth coverage on potential legal challenges and the impact of the election on key issues.
Election results & legal challenges
If no one gets 270 electoral votes, the House of Representatives decides who wins the presidency, with each state delegation getting one vote.
Any effort to derail the electoral process would run up against an array of new guardrails this time around, legal experts say, making it unlikely that any such attempt would succeed.
Democrats have "a playbook to protect the integrity of our elections — before and after November 5," the memo by the Harris campaign and the DNC says.
Sheriff Dar Leaf and other "constitutional sheriffs" have become prominent figures in the election denial movement, and among the most dangerous, critics say.