A special tribunal has recommended that former Italian interior minister and far-right League party leader Matteo Salvini face trial for holding scores of migrants on board a coast guard ship docked in a port in Sicily in July.

In a court document seen by Reuters, Sicilian magistrates ask parliament for authorization to continue their investigation into Salvini for alleged kidnapping, saying he abused his powers and "deprived 131 migrants of personal liberty.

In July Salvini, then interior minister, ordered the migrants, including children, remain on board the Italian coast guard ship Gregoretti until other European countries agreed to take most of them in.