Fernandez enters office with her right-wing party holding absolute majority in the country's legislature.

Laura Fernandez has been sworn in as Costa Rica’s new president and has vowed to fight rising crime in the Central American country, as well as maintain close ties with the United States.

Fernandez defeated a crowded field in the February 1 vote to replace outgoing president Rodrigo Chaves, who has remained a close ally of US President Donald Trump.

In an unorthodox move, Chaves is set to remain in the government as dual minister of the presidency and finance, assuring outsized influence in the incoming administration.

Further underscoring plans to maintain close ties with the US, Fernandez has appointed her second vice president, Douglas Soto, as ambassador to Washington.

Kristi Noem, the US special envoy spearheading the Trump administration’s militaristic approach to Latin America, dubbed “Shield of the Americas”, was at Friday’s inauguration.

So too was Israeli President Isaac Herzog, as part of efforts to boost ties with the region during the political fallout from the genocide in Gaza.

The 39-year-old Fernandez has vowed sweeping reforms to Costa Rica’s judiciary and security laws, as well as a broad crackdown on crime.

Last week, as she introduced her new security minister, Gerald Campos, Fernandez vowed “a war without quarter, a heavy-handed war against organised crime”.

Costa Rica has long been considered one of the most stable countries in Central America, but crime has surged in recent years as it has increasingly become a transit route for smuggling drugs to the US.

Costa Rica is building a maximum security prison modelled on El Salvador’s anti-terrorism CECOT centre, where hundreds of Venezuelans were held without trial after deportation ⁠from the US early last year.

Like El Salvador, Costa Rica has also agreed to accept non-citizens deported from the US per an agreement signed in March.

Rights groups have condemned the so-called “third-country agreements” for stranding deportees in countries in which they have no ties and could be subject to inhumane conditions.

Fernandez’s right-wing Sovereign People’s Party (PPSO) won 31 of 57 seats in the single-chamber legislature.

That gives her party an absolute majority as she takes office.