Main candidates for Spanish general elections People's Party (PP) Pablo Casado, Spanish acting Prime Minister and Socialist…
The main candidates for the Spanish general elections pose before a televised debate in Madrid, Spain, Nov. 4, 2019.

MADRID - The main candidates to become Spain's next prime minister clashed Monday over how to handle Catalonia's independence drive, ahead of a repeat election that opinion polls show could be as inconclusive as the one in April.

Opinion polls suggest a third of voters are still unsure who they will vote for Sunday, meaning Monday's televised debate could be decisive. At this stage, polls point to a stalemate, with no party or bloc of parties having a majority.

FILE - People's Party (PP) candidate Pablo Casado speaks in Madrid, Spain, April 28, 2019.

Catalonia's regional capital, Barcelona, has been rocked by weeks of sometimes violent protests since nine separatist leaders were sentenced to jail in mid-October for their role in a failed independence bid.

"You don't believe in the Spanish nation," the leader of the conservative People's Party (PP), Pablo Casado, told acting Prime Minister Pedro Sanchez, accusing him of being too soft on the Catalan separatists.

Sanchez, a Socialist, is leading in opinion polls but has lost support, while right-wing parties have grown more popular since last month's rallies in Catalonia saw some protesters wreak havoc and throw Molotov cocktails at police.

Leader of VOX party, Santiago Abascal, arrives at a televised debate ahead of general elections in Madrid, Spain, Nov. 4, 2019.

Right-wing parties are now competing on which would take a harder line on the restive region, hoping to attract more votes Sunday.

"There's a permanent coup d'etat in Catalonia," said the leader of the far-right Vox party, Santiago Abascal, saying PP and the Socialists, which have dominated Spanish politics for decades, were both to blame.

Vox won its first parliamentary seats in April and opinion polls show that, boosted by anger over Catalonia protests, it can now hope to win more than 40 seats, up from 24 in the previous ballot. There are 350 seats up for grabs.

Poll results

FILE - Spain's Socialist leader and acting Prime Minister Pedro Sanchez attends a rally to mark the kick off his campaign ahead of the general election in Seville, Spain, Oct. 31, 2019.

Sunday's parliamentary election will be the fourth in four years for Spain. New parties have emerged after the financial crisis, fragmenting the political landscape and making it much harder to form governments with stable majorities.

Polls carried out by GAD3, Sigma Dos and NC Report and published Monday pointed to the Socialists winning but falling short of a majority, with their numbers dropping to about 120 seats from the 123 they won in April. Vox was projected to become the third-biggest party.

PP would get more seats than in April, while the liberal Ciudadanos would be the most damaged by the repeat election.

All possible scenarios for deals to form a government are fraught with difficulties. Sanchez on Friday ruled out forming a "grand coalition" with PP.

Debating Catalonia

Leader of Ciudadanos' party Albert Rivera and debate moderator Maria Casado arrive at a televised debate ahead of general elections in Madrid, Spain, Nov. 4, 2019.

Challenged by his rivals on Catalonia, Sanchez said he had tackled the protests with a firm and proportional response. He added that, if elected prime minister, he would amend the country's laws to make clear that organizing an illegal independence referendum, like Catalonia's regional leaders did in 2017, is a crime.

Sanchez, who became prime minister in June last year after parliament ousted the conservatives in a corruption scandal, has been acting prime minister since the April election.

He also hit back at Casado and at Ciudadanos leader Albert Rivera, saying they were "the two representative of the cowardly right in front of an aggressive far-right," condemning their deals at local and regional levels with Vox.

FILE - Podemos leader Pablo Iglesias speaks during a plenary session at Parliament in Madrid, Spain, Sept. 11, 2019.

The leader of far-left Unidas Podemos, Pablo Iglesias, with whom Sanchez failed to strike a deal to form a government after the April ballot, told Sanchez he "was wrong" if he thought the right would help solve the Catalan problem, saying dialogue with the separatists was the only solution.

While all agreed that a slowing down of Spain's economic growth will be a major issue for who becomes prime minister, the candidates also clashed on economic policies, and in particular on taxation, with Casado saying: "In order for the Spaniards not to lose their jobs, Sanchez must lose his."

Vox's Abascal had not focused much on immigration in the April ballot — unlike many far-right party leaders facing elections in Europe — but took a harder line Monday, accusing Sanchez of not controlling who enters Spain.