After prolonged negotiations, Socialist leader Pedro Sánchez has successfully secured a parliamentary vote, allowing him to serve another term as Spain's prime minister.

With a four-seat majority in the 350-seat chamber, this victory follows his negotiation of an amnesty deal for Catalans involved in an unsuccessful attempt to break away from Spain.

Despite the Popular Party winning elections in July, their leader, Alberto Núñez Feijóo, was unable to form a majority. Sánchez emphasized to MPs that the amnesty agreement aimed to "heal wounds."

However, critics, angered by his reliance on two Catalan pro-independence parties for a majority, fear that his proposed amnesty for numerous politicians and activists could fuel another secession attempt, jeopardizing Spain's territorial integrity.

Upon confirmation of the vote results, Socialist MPs applauded Sánchez for several minutes, while protesters outside the Spanish Congress building voiced their disapproval by booing the departing MPs.

Last weekend tens of thousands of Spaniards took part in protests across Spain, and Mr Feijóo has accused the prime minister of pursuing his interests rather than his country's.

The Popular Party leader shook his opponent's hand after the vote but later declared to reporters: "I told the president of the government that this was a mistake but he is responsible for what he has just done."

The Socialists were clearly in the hands of those who wanted "recognition of a nation different from that of Spain and a referendum for self-determination", Mr. Feijóo declared.

Shortly before the vote, Mr Sánchez linked attempts to question the legitimacy of his new government to part of a global trend. He referred to the presence of former Fox News TV anchor Tucker Carlson at a recent protest outside the Socialist Party headquarters in Madrid.

"We've seen it in the United States, in Brazil and other parts of the world where there is a political right and political far right who do not accept the result of elections," he said.

Several Socialist members of parliament were chased and had eggs thrown at them as they left a cafe near Congress. One egg hit MP Herminio Sánchez and delegates were advised to look after their safety in light of the febrile political atmosphere.

Buses hired by right-wing Catholic organization Hazte Oír drove past the congress building with anti-Sánchez messages on them. One had a picture of Sánchez made to look like Adolf Hitler, with the slogan: "Sánchez dictator."

A hint of the fragility of his new government came from Ione Belarra, whose Podemos party is part of a broad left-wing alliance called Sumar, which is part of the new ruling coalition.

Podemos has so far not been invited to run any of the ministries in the new government. "The Socialist Party likes a leftist regime, a docile left that does whatever the Socialist Party wants," she complained.