Laura Fernández Delgado declared victory in the Costa Rican presidential election on Sunday after preliminary results showed her Sovereign People’s Party leading the national vote with just over 48% support.

The National Liberation Party followed in second place with approximately 33% of the vote, according to the latest official tally from Costa Rica’s Supreme Electoral Tribunal, which oversees and certifies national elections.

"Change will be deep and irreversible," Fernández said at her victory party in San Jose, according to a translation of her remarks from Reuters.

A former government minister, she is the handpicked successor of outgoing President Rodrigo Chaves, who is constitutionally prohibited from seeking re-election.

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Fernández, 39, is set to become Costa Rica’s second female president, after Laura Chinchilla, who served from 2010 to 2014.

Secretary of State Marco Rubio on Monday congratulated Fernández on her victory in Costa Rica’s presidential election, emphasizing the United States’ commitment to working closely with her incoming administration.

"Under her leadership, we are confident Costa Rica will continue to advance shared priorities to include combatting narco-trafficking, ending illegal immigration to the United States, promoting cybersecurity and secure telecommunications, and strengthening economic ties," Rubio said.

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Reuters reported that Fernández, who is married and has a young daughter, has built her political profile around conservative Catholic values and a strong emphasis on family, helping her gain traction among Costa Rica’s expanding evangelical electorate.

She has publicly expressed admiration for Nayib Bukele, the president of El Salvador, and his tough stance on crime, signaling openness to enhanced security measures in violence-prone areas.

Fernández has also said she would complete construction of a maximum-security prison modeled on El Salvador’s CECOT facility as part of a broader strategy to address serious crime.

The president-elect is scheduled to be sworn in on May 8.

Fox News' Emma Bussey contributed to this report.

Costa Ricans have elected conservative populist Laura Fernández as their next president, according to preliminary results, making her the latest right-leaning leader to win office in Latin America.

With results from 96.8% of polling places counted, Fernández of the Sovereign People’s Party won 48.3% of the vote, the Supreme Electoral Tribunal reported.

Her closest challenger, economist Álvaro Ramos of the National Liberation Party, trailed with 33.4%, the Associated Press reported. 

Ramos conceded the race on election night, with Fernández, 39, to begin her four-year term in May.

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A former government minister, Fernández is the chosen successor of outgoing President Rodrigo Chaves, who is constitutionally prohibited from seeking re-election.

She campaigned on continuing Chaves’ populist agenda, which reshaped Costa Rican politics by arguing against traditional parties and promising tougher action on crime.

Fernández served as minister of national planning and later as minister of the presidency, giving her a central role in Chaves’ administration.

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Crime had dominated the campaign in Costa Rica amid sharp rises in homicides, gang activity and drug trafficking by cartels.

The murder rate had increased by 50% over the last six years, according to reports.

Fernández pledged a hard-line security strategy, including increased cooperation with the U.S. Drug Enforcement Administration and tougher measures against organized crime.

She has also floated controversial proposals inspired by El Salvador’s President Nayib Bukele.

This included construction of a special prison for gang leaders, the Associated Press reported.

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"My hand won’t shake when it comes to making the decisions we need to restore peace in Costa Rican homes," Fernández said during the campaign.

U.S. Secretary of State Marco Rubio congratulated Fernández in a statement Monday.

"Under her leadership, we are confident Costa Rica will continue to advance shared priorities to include combating narco-trafficking, ending illegal immigration to the United States, promoting cybersecurity and secure telecommunications, and strengthening economic ties," Rubio said.

"I hope that we can immediately lower the flags of whichever political party and start working only in favor of the Costa Rican flag," Fernández said after the result. 

"I believe the Costa Rican people expect nothing less of us," she added.