AP Photo/Alex Brandon FORMER FBI DIRECTOR James Comey at the beginning of the Senate Intelligence Committee hearing June 8 on Capitol Hill in Washington.

WASHINGTON (AP) — A clear majority of Americans believe President Donald Trump has tried to interfere with the investigation into whether Russia meddled in the 2016 election and possible Trump campaign collusion, a new poll released Thursday shows. Just 1 in 5 support his decision to oust James Comey from the FBI.

Following Comey’s blockbuster appearance before Congress, an Associated Press-NORC Center for Public Affairs Research poll shows 68 percent of Americans are at least moderately concerned about the possibility Trump or his campaign associates had inappropriate ties to Russia. Almost half of Americans say they’re very concerned. Only 3 in 10 say they’re not that concerned.

Americans largely view the issue along partisan lines. Sixty-two percent of Republicans say they’re not very concerned or not at all concerned about any Russia ties. Though just over half of Americans say they disapprove of Trump’s firing of Comey, the number grows to 79 percent among Democrats. Overall, only 22 percent of Americans support Comey’s dismissal.

For Sandra Younger, a 50-year-old from San Diego, Comey’s exit reinforced her suspicion “something fishy” was going on with the president and Russia. She said it was inappropriate to fire Comey given that he was overseeing the Russia investigation.

“If I had nothing to hide and someone wanted to investigate, I would say, ‘Go ahead, do your thing, I don’t care, because you won’t find anything,'” said Younger, a Democrat who imports jewelry supplies.

But William Shepherd, a maintenance worker from Anderson, Indiana, felt it was the president’s prerogative to choose his FBI director. He said he was untroubled by claims Trump tried to persuade Comey to back off the investigation, saying those revelations only emerged after Comey was fired and wanted to defend himself.

“These headlines don’t really concern me, although they are attention-grabbers,” said Shepherd, a 40-year-old Republican.

Of the 6 in 10 Americans who think Trump tried to obstruct or impede the investigation, most are Democrats and independents. Only a quarter of Republicans feel Trump meddled in the probe.

The poll began the day before Comey testified publicly before the Senate intelligence committee and continued through Sunday. Three percent of interviews were conducted before the hearing.

Americans are mixed on whether the Justice Department investigation, now led by Robert Mueller, can be fair and impartial. Twenty-six percent are very or extremely confident it can be. Thirty-six percent are moderately confident and an equal share of Americans aren’t very confident or are not at all so.

Mueller, the former FBI director, was put in charge of the investigation after Trump fired Comey and public pressure mounted for a special counsel to take over. Comey later testified he’d authorized a friend to disclose to the media his notes on conversations with Trump about the investigation, in hopes that it would lead the Justice Department to name a special counsel.

The poll shows the public relatively unsympathetic to those leaking information about the investigation. Fifty-four percent say they’re doing more harm than good by potentially damaging national security.