As Donald Trump Incites Feuds, Other G.O.P. Candidates Flee His Shadow
By JONATHAN MARTIN and ALEXANDER BURNSAUG. 6, 2016

After a disastrous week of feuds and plummeting poll numbers, Republican leaders have concluded that Donald J. Trump is a threat to the party’s fortunes and have begun discussing how soon their endangered candidates should explicitly distance themselves from the presidential nominee.

For Republicans in close races, top strategists say, the issue is no longer in doubt. One House Republican has already started airing an ad vowing to stand up to Mr. Trump if he is elected president, and others are expected to press similar themes in the weeks ahead.

In the world of Republican “super PACs,” strategists are going even farther: discussing advertisements that would treat Mr. Trump’s defeat as a given and urge voters to send Republicans to Congress as a check on a Hillary Clinton White House. The discussions were described by officials familiar with the deliberations, several of whom spoke on the condition of anonymity about confidential planning.

For now, some of the party’s most vulnerable incumbents are simply hoping to avoid what they see as the taint of association with their standard-bearer.

Two members of Congress locked in competitive races made themselves scarce when Mr. Trump arrived in their states on Friday. The two, Senator Ron Johnson of Wisconsin and Representative David Young of Iowa, held events elsewhere.

Senator Patrick J. Toomey of Pennsylvania, in a conference call with reporters the same day, was less subtle. “Donald Trump is in a category unto himself,” Mr. Toomey said, predicting that his state’s voters “will make a completely separate decision” between the top of the ticket and the Senate campaign this year.

That is increasingly the hope of nearly every Republican leader across the country.

Mr. Trump’s plunge in polls this week, along with his dual attacks on the family of a fallen American soldier and the leadership of his own party, has convinced veteran Republican strategists that most of their candidates must navigate around the presidential nominee.

Plans for ads that distance congressional candidates from the top of the ticket have accelerated. “You will see them by early to mid-September now,” even before the first debate on Sept. 26, predicted Scott Reed, the senior political strategist for the United States Chamber of Commerce.

At a recent conference of Republican donors, Paul D. Ryan, the speaker of the House, warned that even the party’s substantial majority in that chamber might be in jeopardy.

“The conclusion has become that the guy is incorrigible,” said Thomas M. Davis III, a former House member from Virginia who is still close to many of the party’s leaders. “He’s going to leave our candidates with no choice but to go their own separate way.”

Mr. Trump’s campaign did not respond to requests for comment, but on Friday night he tried to calm angry Republicans by endorsing, belatedly, the re-elections of Mr. Ryan and Senators John McCain of Arizona and Kelly Ayotte of New Hampshire. Mr. Trump had been feuding with them after they criticized his ridicule of the parents of Humayun Khan, a Muslim American Army captain killed in Iraq. Captain Khan’s parents had denounced Mr. Trump during the Democratic National Convention.

Reince Priebus, the chairman of the Republican National Committee, had urged Mr. Trump to stand behind Mr. Ryan and the senators for the sake of party unity. Some leading Republicans have expressed hope that Mr. Trump can at least stabilize his campaign by Labor Day, when many voters begin paying attention to congressional races.

But with such an erratic and belligerent candidate leading their ticket, many in the party have long seen a go-your-own-way strategy as inevitable.

David McIntosh, the president of the Club for Growth, a group that advocates small government, said the organization was studying how to get Republican voters who may dislike Mr. Trump to turn out for the party’s down-ballot candidates. Mr. McIntosh said the Club for Growth intended to convince voters that they would need a “strong voice in the Senate and House,” regardless of their feelings about the presidential race.

“You hope Trump does well so that the base Republican vote comes out and is strong,” Mr. McIntosh said. “But you also have to plan for if he doesn’t do well.”

At the moment, that seems likely. Mrs. Clinton opened a large lead last week in national polls, with a handful showing her leading by double digits. Perhaps more significantly, new surveys indicate that she has staked out leads in states Mr. Trump most likely needs to win the White House, including Florida, Pennsylvania and Michigan, and that she is also close or edging ahead in Republican-leaning states such as Georgia, where at least one poll has her ahead.

Mrs. Clinton’s advantage may ebb. The surveys were taken soon after the Democratic National Convention and during Mr. Trump’s gaffe-filled week. But Republicans are planning for the worst.

Also under consideration is the possibility of a huge ad campaign to promote an agenda of conventional Republican positions, along the lines of economic proposals outlined by Mr. Ryan.