WASHINGTON — Pledging cooperation, the top Republican and Democrat on the Senate intelligence committee said Wednesday they would steer clear of politics in their panel’s probe of Russian interference in last year’s election. They made a point of putting themselves at arm’s length from the House investigation marked by partisanship and disputes.

Richard Burr of North Carolina, the GOP chairman of the Senate committee, told reporters on Capitol Hill he would not even answer questions about the House probe. “We’re not asking the House to play any role in our investigation. We don’t plan to play any role in their investigation,” Burr said ahead of his panel’s open hearing Thursday.

Standing alongside his committee’ ranking Democrat, Sen. Mark Warner of Virginia, Burr said: “Mark and I work hand in hand on this. … We’re partners to see that this is completed and that we have a product at the end of the day that we can, in bipartisanship, support.”

The senators’ comments came the same day an attorney for former National Security Adviser Michael Flynn said the retired U.S. Army lieutenant general has not been interviewed by the Senate intelligence committee. One of Flynn’s lawyers, Robert K. Kelner, said they have had discussions with committee staff members, but Flynn has not been contacted directly.

So far, the committee has requested 20 individuals to be interviewed. Five have been scheduled, and the remaining 15 are likely to be scheduled within the next 10 days. Additional witnesses could also be interviewed.

During a news conference, Burr identified just one of the witnesses: President Donald Trump’s son-in-law, Jared Kushner. The White House has said Kushner, a senior adviser to Trump, has volunteered to answer questions about arranging meetings with the Russian ambassador and other officials.

Asked whether the committee had spoken to Flynn or his representatives, Burr told reporters, “It’s safe to say that we have had conversations with a lot of people, and you would think less of us if General Flynn wasn’t in that list.”

Trump asked Flynn, a former director of the Defense Intelligence Agency, to step down last month from his post as national security adviser. The president said he made the decision because Flynn had misled Vice President Mike Pence and other White House officials about his conversations with Russia’s ambassador to the U.S.

Flynn’s ties to Russia have been scrutinized by the FBI. They also are part of the House and Senate committee investigations into contacts between Trump campaign officials and Russians.

On the House side, Democrats have called for intelligence committee Chairman Devin Nunes to recuse himself because of his previous ties with Donald Trump’s team before Trump took office.

Nunes, R-Calif., met with a secret source on the White House grounds last week to review classified material, which he says indicates that Trump associates’ communications were captured in “incidental” surveillance of foreigners. Trump has used Nunes’ revelations to defend his claim that former President Barack Obama tapped phones at Trump Tower in New York, though Nunes and his committee’s top Democrat, Adam Schiff of California, say there is no such evidence.

In response to a reporter’s question, Burr said he had not personally coordinated with the White House in shaping the scope of the Senate committee’s investigation.

Asked if he could promise to oversee an impartial probe, Burr responded: “Absolutely. I’ll do something I’ve never done. I’ll admit I voted for him (Trump). … But I’ve got a job in the U.S. Senate and … it overrides any personal beliefs that I have or loyalties that I might have.”

Warner said he had seen no evidence the White House was interfering and would complain publicly if he did.

Ahead of Thursday’s Senate hearing, Warner pledged to keep the investigation focused on the reason it was started.

“An outside foreign adversary effectively sought to hijack our most critical democratic process — the election of the president — and in the process decided to favor one candidate over another,” Warner said. “I can assure you, they didn’t do it because it was in the vested interest of the American people.

“Russia’s goal, Vladimir Putin’s goal, is a weaker United States — weaker economically, weaker globally — and that should be a concern to all Americans, regardless of party affiliation.”

Burr said the investigation’s mission is to look at all activities Russia might have undertaken to alter or influence the election and to examine contacts any campaign had with Russian government officials that could have influenced the process.