Three Madrid courts overturned a ban by Spain’s electoral authority to allow the fugitive former Catalan President Carles Puigdemont and two of his former cabinet ministers to run in the forthcoming European elections on 26 May.

The decision also applies to Puigdemont’s fellow Catalan pro-Catalan secessionist former ministers, Antoni Comín and Clara Ponsatí, who also face charges of inciting a rebellion for using public resources to organize an illegal independence referendum in 2017.

According to a report by the European Parliament’s legal services cited by Reuters, the three may be unable to take their place, if elected, because they would be required to return to Spain to take an oath.

Last week the three pro-independence politicians were banned from the race as the majority of the electoral authority voted to exclude them. The decision was challenged by Madrid’s Attorney General.

The opposition People’s Party will challenge the decision in Spain’s Constitutional Court. Puigdemont has also pledged to sue some members of Spain’s electoral authority for breach of official duty.