Why President Trump Is a Threat to GOP Senate Prospects

As Air Force One sped from Billings, Mont., to Fargo, N.D., on Sept. 7, President Donald Trump dipped into the press cabin to casually announce that he was prepared to slap another quarter-trillion dollars in tariffs on Chinese goods. "There's another $267 billion ready to go on short notice, if I want," Trump declared.

Back on the ground, Republican strategists were soon beside themselves.