The son of a dual United States-Saudi citizen who has been imprisoned in Saudi Arabia has met members of the US Congress as he seeks help in securing his father's release.

Ahmed Fitaihi said his doctor father, Walid, has been tortured and allowed little contact with his family in 16 months of his custody so far.

Fitaihi spoke alongside a brother of Lujain Alhathloul, a women's rights activist who has been in custody since May and went on trial this week.

Al Jazeera's Mike Hanna reports.

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