The European Union’s institutions are gearing up for a fight over Hungary and a contentious transfer of 10 billion euros (nearly $11 billion) in funds to Budapest.

The European Parliament decided to assess Thursday whether to take the bloc’s executive branch, the European Commission, to court over allegations that it gave into blackmail from Prime Minister Viktor Orbán to get his approval to start membership talks with Ukraine.

The European Parliament made the decision in a 345-104 vote and tasked its legal department to prepare the groundwork for a possible challenge at the EU’s highest court. It wants to see whether the European Commission took all measures “to protect the EU’s financial interests” in its dealings with Orbán. They said that Hungary didn’t meet the rule of law requirements to get the money.