A 91-year-old US congressman is facing the toughest test of a very long political career with a run-off against a candidate barely half his age.

Ralph Hall first ran for office in 1950 and first won his congressional seat when Jimmy Carter was president.

The oldest-ever member of the US House is trying to stave off a challenge in the Republican primary from former US attorney John Ratcliffe, in a Texas district stretching from suburban Dallas east to borders with Louisiana and Oklahoma.

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