Carnival and the Havana Docks Corp are locked in a battle to force the disclosure of their political lobbying efforts.

In court papers filed in their ongoing legal battle over the cruise major's trips to Cuba, the two sides asked US District Judge Beth Bloom to force the production of certain documents and redactions to be removed from others.

All 10 documents Carnival seeks relate to Havana Docks' lobbying efforts — including two involving an ambassador — while Havana Docks wants to see emails Carnival chief executive Arnold Donald sent to Florida Senator Marco Rubio.