President Barack Obama has called the West Africa Ebola outbreak "a threat to global security" as he announced a larger US role in fighting the virus.

 President Barack Obama called Israeli Prime Minister Benjamin Netanyahu on Sunday to discuss an international nuclear deal with Iran that has threatened to raise tensions between the close allies, the White House said.

 President Barack Obama used a memorial service for the victims of America's latest mass shooting on Sunday to make another impassioned appeal to reform gun ownership laws.