>> This is very honest, I'll never let this.>> President Elect Donald Trump using what he's dubbed his Thank You Tour Thursday to announce a key nomination to his cabinet.>> We are going to appoint Mad Dog Mattis
But we're not announcing it until Monday so don't tell anybody.
>> General James Mattis is considered a seasoned military strategist. His appointment a sign that Trump plans to chart a very different path from President Obama who's increasingly looked to allies to fight US battles abroad. Mattis is revered in the Marines and is known for his distrust of Iran.
Trump's announcement comes on the same day as reports that President Obama said he supports requiring women to register for the military draft. Becoming the first President to do so since former President Jimmy Carter. General Mattis will need a waiver from Congress to take over at the Pentagon. The law requires a Defense Secretary be a civilian for at least seven years before filling the role.