Romney is 'trying to give cover to other Republicans' with support for witnesses
01:17Washington Post reporter Bob Costa says sources have told him to keep an eye on retiring senators, as well as Sens. Joni Ernst (R-Iowa) and Thom Tillis (R-N.C.)
Washington Post reporter Bob Costa says sources have told him to keep an eye on retiring senators, as well as Sens. Joni Ernst (R-Iowa) and Thom Tillis (R-N.C.)