Jiya Litini Shugaban Amurka Barack Obama, ya ce babu wata shaidar cewa maharin nan da ya aikata kashe-kashen tarin jama'a mafi muni a tarihin Amurka, a wata mashakatar-dare ta 'yan luwadi da ke Orlando, jihar Florida, ya samu umurni daga wata kungiyar ta'addanci ta kasar waje.