The outgoing President, Xiomara Castro, had alleged that an "electoral coup" was taking place and earlier this month said the election was being marred by "interference" from Trump.

When he endorsed Asfura for president, Trump said there would be "hell to pay" if his very narrow lead was overturned in the count.

He also threatened to withdraw financial support from the US if Asfura didn't win.

In a surprise move, the US president also pardoned Juan Orlando Hernández, a member of Asfura's National Party, who was serving a 45-year jail sentence in the US on drug and weapons charges. Castro was barred by the constitution from standing for a second term.

Nine days after the vote, Nasralla accused "corrupt people" of manipulating the vote count in the Central American nation. He also said Trump's comments had damaged his chances of winning.

In his statement following the announcement of the result, Rubio said the US would "look forward to working with his incoming administration to advance our bilateral and regional security co-operation", adding the two countries would "end illegal immigration" to the US, while strengthening economic ties.