Son, was interviewed by the committee investigating the capitol riot for two hours on tuesday via video conference, according to a person close to him. his sister ivanka trump testified before the committee last month. and for former president trump, a big first test of his power to steer the midterm elections. the senate candidate he endorsed in ohio, author j.d. vance, coming from behind in the polls to win that state s primary last night. vaughn hillyard is there. reporter: the american political right moving even closer to donald trump s image on tuesday night. they wanted to write a story that this campaign would be the death of donald trump s america first agenda ladies and gentlemen, it ain t the death of the america first agenda reporter: j.d. vance, winning a crowded gop primary for ohio s u.s. senate seat, leaping roughly 20 percentage points since trump endorsed him. i want to pick somebody that s going to win. and this man is going to win come on up, j.d. report