Senator Mitt Romney, ex-presidential candidate, not seeking re-election in 2024

Senator Mitt Romney (J Scott Applewhite/AP)

Utah Republican Senator Mitt Romney has said he will not run for re-election in 2024, creating a wide-open contest in a state that heavily favours Republicans and is expected to attract a crowded field.

Mr Romney, a former presidential candidate and governor of Massachusetts, made the announcement in a video statement.