'It'll be an ugly one': GOP frantic over looming 'trainwreck' that will fracture the party

Republicans are looking at a battle in Texas for a U.S. Senate seat as a looming trainwreck in the upcoming midterm election that, at the moment, looks to be unavoidable.

A decision by scandal-plagued Texas Attorney General Ken Paxton (R) to challenge longtime Sen. John Cornyn (R) has set off a panic that millions of dollars will be wasted on a primary fight for a seat that, under normal circumstances, would be a GOP lock in the conservative state, but may be put in play after a potentially bruising battle for the nomination.