But the bill, approved by Spain’s parliament earlier this year, is being challenged by the Supreme Court, which argues the pardon does not apply to embezzlement, unlike other crimes that Puigdemont had previously been charged with. Puigdemont could be placed in pretrial detention.

The former Catalan leader’s return threatened to complicate a deal brokered after months of deadlock between Salvador Illa’s Catalan Socialist Party (PSC) and the other main Catalan separatist party and left-wing Esquerra Republicana (ERC).

That deal had ensured just enough support in Catalonia’s parliament for Illa to become the next regional president in an investiture debate Thursday.

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Barry Hatton reported from Lisbon, Portugal.