The bench could also examine Section 5 of the 1965 Voting Rights Act - a provision that forces nine US states with a history of electoral discrimination to have all changes to voting rules first approved in Washington.

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The act also eased the restrictions on postal voting, a provision that has placed a large question mark over the probity of British electoral arrangements.

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This provision becomes effective only when enough other states to make up a majority of the Electoral College adopt similar legislation.

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