Matt Frei, presenter of BBC World News America, thinks Mr Obama needs to respond to humour with some jokes of his own.
How will the US react to Iran’s missile test?
“South America’s Uefa Cup lags behind the Copa Libertadores”
A leading US think-tank says al-Qaeda can be defeated if the US relies less on force and more on intelligence and policing to find the group’s leaders.
The eldest daughter of Chile’s late leader Gen Augusto Pinochet says she will run as a local councillor in October’s elections.
George W Bush becomes the first US President in more than 50 years to approve the death sentence of a soldier.
US bank Merrill Lynch says it will write off another $5.7bn and needs to raise another $8.5bn by selling shares
Cubans weigh up the benefits of economic reform