Mr Trump raised the possibility as he made unsubstantiated allegations that increased postal voting will result in fraud.
The dates of federal elections are set by the US Congress, and the country’s constitution makes no provisions for a delay to the January 20, 2021 presidential inauguration.
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Mr Trump tweeted: “With Universal Mail-In Voting (not Absentee Voting, which is good), 2020 will be the most INACCURATE & FRAUDULENT Election in history. It will be a great embarrassment to the USA. Delay the Election until people can properly, securely and safely vote???”
There is no evidence of widespread voter fraud through postal voting, even in states with all-mail votes.