Guatemalan President Jimmy Morales has announced he is expelling the head of a UN anti-corruption commission that is investigating his campaign's financing.

If Dilma Rousseff is impeached, she will be the 18th elected Latin American president since 1985, excluding Haiti, forced to leave office by means other than the ballot box, says Gretchen Helmke.

Software company founder John McAfee was yesterday hospitalised after being denied political asylum in Guatemala.

Retired General Otto Perez Molina was sworn in as president of Guatemala, calling on the United States and Mexico to help him fight a wave of drug trafficking and violence that has overwhelmed the Central American country.