Spain’s lower house today rejected an amnesty bill because of differences in its scope between the ruling Socialists and pro-autonomy parties in Catalonia, a blow to Prime Minister Pedro Sanchez that reflects his parliamentary fragility.

The bill will now go back to a parliamentary committee for debate and could potentially be sent back to undergo a new vote in the lower house.

The amnesty bill is expected to determine Pedro Sanchez’s second term and has already sparked major protests against him.

Carles Puigdemont’s Catalan separatist Junts voted against the bill after failing to reach a last-minute deal with the PSOE Socialists. Junts wanted all terrorism exemptions removed from the bill, as some of its politicians are currently under investigation by courts for alleged terrorism-related crimes.

The bill was promoted by the Spanish Socialist Workers’ Party (PSOE) in exchange for parliamentary support for a new term from the Catalan separatist parties Esquerra Republicana de Catalunya and Junts.