GOP infighting erupts as Thune warns of legislative ‘trainwreck’

Internal squabbles erupted in the Senate Republican conference Wednesday as GOP senators battled each other and the White House over a variety of issues, prompting Senate Majority Leader John Thune (R-S.D.) to warn that his colleagues face a potential legislative “train wreck.”   Senate Budget Committee Chair Ron Johnson (R-Wis.) clashed with Senate Appropriations Committee…