Liz Crampton and Catherine Boudreau, Politico
Photo Credit: Rainier Ehrhardt/AP

Senate leadership's goal of holding a floor vote on the farm bill this week is now in doubt, as key farm-state lawmakers work to resolve a new demand from Sen. Marco Rubio over a provision that would promote agricultural trade with Cuba.

The Florida Republican on Wednesday declared on Twitter that he’d block any new amendments to the farm bill unless the Senate votes to strike a provision that would allow USDA funding for foreign market development programs to be spent in Cuba — or until senators adopt his proposal to ban U.S. taxpayer dollars from being spent on businesses owned by the Cuban military.