The Economy Is Humming, but Trump Is Tweeting. Republicans Are Worried.

As Democrats enter the fall midterm campaign with palpable confidence about reclaiming the House and perhaps even the Senate, tensions are rising between the White House and congressional Republicans over who is to blame for political difficulties facing the party, with President Trump’s advisers pointing to the high number of G.O.P. retirements and lawmakers placing the blame squarely on the president’s divisive style.

Yet Republican leaders do agree on one surprising element in the battle for Congress: They cannot rely on the booming economy to win over undecided voters. …

America First Action, a political committee aligned with Mr. Trump, conducted a series of focus groups over the summer and concluded the party had a severe voter-turnout problem, brought on in part by contentment about the economy and a refusal by Republicans to believe that Democrats could actually win the midterm elections.

Conservative-leaning voters in the study routinely dismissed the possibility of a Democratic wave election, with some describing the prospect as “fake news,” said an official familiar with the research, who spoke on condition of anonymity because the data was not intended to be disclosed. Breaking that attitude of complacency is now the Republicans’ top priority, far more than wooing moderates with gentler messaging about economic growth. CONT.

Jonathan Martin & Alexander Burns, New York Times