WASHINGTON - US President-elect Donald Trump announced Wednesday that Marco Rubio, Republican US senator from the state of Florida, will be the secretary of state during his second presidential term.

"It is my Great Honor to announce that Senator Marco Rubio, of Florida, is hereby nominated to be The United States Secretary of State," Trump said in a statement, adding that the 53-year-old Cuban American "is a Highly Respected Leader, and a very powerful Voice for Freedom".

Rubio, whose nomination has been reported by US media outlets for days, reacted quickly to Trump's formal announcement, saying on X that he was "honored by the trust President Trump has placed in me" to bear the "tremendous responsibility" of leading the Department of State.

"As Secretary of State, I will work every day to carry out his foreign policy agenda," he added.

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The secretary of state, as is the case for other cabinet members of the presidential administration, will have to be approved by the Senate before assuming office.

"I look forward to earning the support of my colleagues in the US Senate so the President has his national security and foreign policy team in place when he takes office on January 20," said Rubio, who was elected into the Senate in 2010. He was re-elected in 2022 to serve another six-year term.

Rubio ran an unsuccessful presidential campaign in the 2016 election, which saw Trump won his first presidential term.

Now that Rubio will soon be leaving Capitol Hill, Florida Governor Ron DeSantis is tasked with selecting a replacement for Rubio to serve two of the remaining four years of the senator's term, until a special election in 2026 to decide who would fill the seat for the last two years.

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Many names have been speculated for the position, among them Trump's daughter-in-law Lara Trump, who is now the co-chair of the Republican National Committee.

Trump was rumored to have been pressing on DeSantis, a presidential candidate vying for nomination against Trump in the 2024 GOP primary, to select his daughter-in-law.

In one scenario, DeSantis, whose potential second run for president is not out of the question, may name his chief of staff, James Uthmeier, to be a placeholder for him in the Senate until his gubernatorial term ends in 2026, at which point DeSantis could run for the seat himself and, if successful, use it as a launching pad for the White House. 

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Meanwhile, House Speaker Mike Johnson won the Republican nomination to remain in the position, after Trump appeared to have backed him during a meeting with House Republicans.

Johnson, a Louisiana Republican, was elected House speaker in a full chamber vote of 220-209, with unanimous Republican support, in October 2023, which brought weeks of chaos to a momentary halt as Republicans struggled to find a replacement after the historical ouster of Kevin McCarthy.

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Multiple US media outlets projected Wednesday that Republicans will win enough seats to retain control of the US House of Representatives, with the party securing at least 218 seats -- the threshold to maintain majority in the 435-member chamber.

NBC News and CNN made the call Wednesday afternoon, with nine House races yet to be projected. So far, Republicans have flipped seven seats from Democrats, while Democrats have flipped six seats from Republicans, resulting in a tally of 218 to 208.

Despite the victory, a Republican majority in the House will remain slim. In order to win the gavel, Johnson will need near-unanimous support from House Republicans to officially become speaker in January, when a full-chamber vote is scheduled to take place.