 -- Six in 10 Americans think Donald Trump fired FBI Director James Comey in order to protect himself rather than for the good of the country, and most think Trump is trying to interfere with official investigations of possible Russian influence in the 2016 election.

A broad seven in 10 in an ABC News/Washington Post poll also doubt Trump’s word on the Russia issue. That said, 55 percent doubt Comey’s word as well -– likely a sign of his own past controversies, as well as general distrust of Washington.

See PDF for full results, charts and tables.

With Deputy Attorney General Rod Rosenstein testifying before the Senate Intelligence Committee today and Comey himself to do so tomorrow, the survey finds the public taking a particularly dim view of Trump in the controversy. Sixty-one percent say he ditched the director to protect himself; just 27 percent think he did it for the good of the nation.

Fifty-six percent also think Trump is trying to interfere with investigations into possible Russian interference in the election, while just a third think he’s cooperating. And 72 percent report just some or no trust in what Trump says about the issue – half, none at all. Just 21 percent report a great deal or good amount of trust in what the president says about it.

Even conservatives are about twice as apt to have low trust in what Trump says about Russian interference than to have substantial trust, 60-33 percent. And in the president’s own party, Republicans split evenly on the question of trust, 48 percent expressing distrust, 45 percent, trust.

As noted, there’s also skepticism of Comey in the poll, produced for ABC News by Langer Research Associates; 55 percent have just some or no trust in what he says about possible Russian interference. That said, distrust is 17 points lower than it is for Trump, and twice as many Americans have no trust whatsoever in what Trump says on the issue (50 percent) as have no trust at all in what Comey says (25 percent).

Groups

Views that Trump fired Comey to protect himself, and is trying to interfere in the investigation, peak among Democrats, liberals, younger adults, nonwhites and women. Adults age 18 to 39, for example, are 25 points more apt than their elders to think Trump fired Comey to protect himself and 21 points more likely to doubt what the president says about possible Russian interference. Nonwhites are 20 points more likely than whites to think Trump is interfering in the investigations. Women think so more than men by 12 points.

Party lines are sharp: Eighty-eight percent of Democrats and nearly two-thirds of independents think Trump fired Comey to protect himself; 71 percent of Republicans think it was for the country’s good. And Democrats overwhelmingly think Trump is interfering with the investigation, 87-10 percent; that virtually flips among Republicans, with 77 percent saying he’s cooperating. Independents are about twice as likely to think Trump is interfering rather than cooperating.

Similarly, a steep majority of liberals (86 percent) think Trump was protecting himself in firing Comey, as do 66 percent of moderates; that declines to 38 percent of conservatives. A narrow majority of conservatives, 52 percent, think Trump’s decision was for the good of the country.

Views of Comey also are partisan, but less overwhelmingly so. Fifty-four percent of Democrats trust what he says on the Russia issue, declining to 32 percent of independents and 18 percent of Republicans; it’s 60-37-16 percent from liberals to moderates to conservatives. There’s a larger division by race on Comey than on Trump, with whites 11 points more likely than nonwhites to distrust Comey.

These results set the stage for Comey’s highly anticipated testimony Thursday: Most Americans approach what he has to say with considerable skepticism. Yet far more express deep doubts about what the president says -– and about what he’s done –- in the ongoing Russia controversy.

Methodology

The survey was produced for ABC News by Langer Research Associates of New York, N.Y., with sampling, data collection and tabulation by SSRS of Media, Pa. See details on the survey’s methodology here.