 He is certainly untested on a national stage beyond just having won the Senate seat. So at just 39 years old, he turns 40 in a matter of days. This is the third youngest pick ever. And there's some speculation, even on the floor, of whether he's qualified to ascend to the presidency should something happen to President Trump. That's Adam Wren, national politics correspondent for Politico, in a conversation with our Dimitri Sotis.