It could take months for Belgian courts to rule on Spain’s latest attempt to extradite Mr. Puigdemont and the two other Catalan leaders, Antoni Comín and Clara Ponsatí.

The Brussels Public Prosecutor’s Office is examining the possibility of renewing legal proceedings in Belgium, a spokeswoman for the office said.

Should the Belgian courts block the extradition request, the Catalans would continue to sit in the European Parliament, but without special immunity rights.

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