WASHINGTON - US President Barack Obama will deliver an address to the nation from the Oval Office on Sunday night on "his highest priority: keeping the American people safe," the White House announced on Saturday.The address will be his first from the Resolute Desk since August of 2010, when the president marked the end of combat operations in Iraq."The president will provide an update on the ongoing investigation into the tragic attack in San Bernardino," according to the press secretary. A gun rampage in that California resulted in the deaths of 14 people last week, perpetrated by sympathizers of the terrorist organization known as Islamic State (ISIL). "The president will also discuss the broader threat of terrorism, including the nature of the threat, how it has evolved, and how we will defeat it. "He will reiterate his firm conviction," White House press secretary Josh Earnest continued, "that ISIL will be destroyed and that the United States must draw upon our values – our unwavering commitment to justice, equality and freedom – to prevail over terrorist groups that use violence to advance a destructive ideology."