Brazil's President Asks Supreme Court to Stop Impeachment

President Dilma Rousseff asks the Supreme Court to block impeachment proceedings against her, in a final attempt to stop the process.

President Barack Obama is to visit Hiroshima later this month - making him the first serving US President to visit the Japanese city since the Americans dropped a nuclear bomb there in 1945.

UK Prime Minister David Cameroon describes Nigeria and Afghanistan as possibly the two most corrupt countries in the world.