The all-Democratic Massachusetts congressional delegation is unanimously calling for Attorney General Jeff Sessions to step down amid revelations he twice talked with Russia’s ambassador during the presidential campaign — and denied having such contact during his confirmation hearings earlier this year.

"The fact that our own government and our own sitting attorney general is part of that effort to block an investigation and that he himself gave false testimony in response to questions around the Russian interference in our election is deeply, deeply troubling," U.S. Rep. Stephen Lynch, a South Boston Democrat who serves on the powerful House Oversight and Government Reform Committee, told Boston Herald Radio today, referring to Sessions' under-oath questioning by the Senate Judiciary Committee. "He compromised himself. He could have come out with this during the confirmation hearings – I think it would have raised a lot of eyebrows – but he chose to be untruthful and there have to be consequences to that."

Asked by Herald radio host Jaclyn Cashman if Sessions was a liar, Lynch said, "Yeah. When you say something that you know is totally false and you do it under oath, yeah, you're a liar, you're a perjurer."

“I believe Attorney General Sessions should resign. It’s not a statement I make lightly as a person who was a district attorney himself for 12 years, I realize the magnitude of that statement,” U.S. Rep. William P. Keating told reporters at Logan Airport after stepping off a plane this afternoon from D.C. “The credibility of Attorney General Sessions going forward is not there and you cannot be effective and serve your country well under those conditions.”

The Justice Department confirmed to the Washington Post that Sessions' met with Russian Ambassador Sergey Kislyak in July and September last year, while he was serving as a U.S. senator and as a key advisor to the Trump campaign. The meetings occurred as Russia was engaged in a wide-ranging campaign to tilt the presidential election in Trump's favor through cyberattacks, intelligence officials have said.

During his confirmation hearing in January, Sessions told Democratic Sen. Al Franken he was not aware of any official in the Trump campaign having contact with the Russians and then added “I have been called a surrogate at a time or two in that campaign and I did not have communications with the Russians.”

The former Alabama U.S. Sen. then responded with a simple “no” when asked in writing by Vermont Democratic Sen. Patrick J. Leahy, the ranking Democrat on the Judiciary committee, if he had been in contact with the Russian government about the 2016 election.

President Trump today backed Sessions and said he had “total confidence” in the AG amid more than 100 calls for his resignation from Democratic lawmakers. The president added he was not aware of Sessions’ contact with the Russians during the campaign.

“There was absolutely nothing misleading about his answer,” Sarah Isgur Flores, Sessions’ spokeswoman, told the Post last night. “He was asked during the hearing about communications between Russia and the Trump campaign — not about meetings he took as a senator and a member of the Armed Services Committee."

“I am shocked by this whole turn of events and that there continues to be a bizarre relationship between this administration and Russia,” said U.S. Rep. Katherine Clark at Logan. “I think the American people deserve to have an attorney general who is honest with them and honest with Congress, especially when he is under oath. … I think we will be seeing that shortly, I think this is a dramatic turn of events for this administration and this attorney general,” Clark said.

Trump's national security advisor Mike Flynn last month was forced to resign after lying about his talks with Kislyak regarding sanctions the Obama administration levied on Russia for the attempts to influence the election.

U.S. Reps Joseph P. Kennedy III, James P. McGovern, and Seth Moulton all released statements today calling for Sessions’ resignation.

U.S. Sen. Elizabeth Warren took to Twitter, where she said “We need a special prosecutor totally independent of the AG. We need a real, bipartisan, transparent Congressional investigation into Russia,” and followed that up with a tweet saying “And we need Attorney General Jeff Sessions – who should have never been confirmed in the first place – to resign. We need it now.”

"AG #Sessions should resign," U.S. Sen. Markey tweeted. "This is exactly why we need an independent special counsel to investigate #TrumpRussia.”

U.S. Rep. Richard Neal initially said Sessions should recuse himself from any investigation into Trump- Russia ties. About 45 minutes later, he joined the rest of the delegation, tweeting,” After misleading Congress under oath about secret talks with Russians, AG #Sessions should now resign.”

U.S. Rep. Michael E. Capuano, who also was at Logan today, said he would have been fine with Sessions simply rescuing himself, but now feels the AG needs to resign.

Asked about Trump’s expression of confidence in Sessions, the Somerville Democrat said, “didn't he say he had total confidence in Gen. Flynn 2 days before he left?”

“I guess they are going to try to stem the tide, but this has nothing to do with partisan politics and honestly, if Sessions cared about the Trump Administration, if he cared about the reputation of the attorney general, he’d do it,” Capuano added. “I think America deserves better.”

Asked if Sessions does not step down whether Congress should proceed with impeachment, Lynch responded: "Absolutely. He lied during his confirmation proceedings. And on a very, very pertinent and important question. And he is the chief law enforcement officer of the United States of America. so yeah, definitely there would be impeachment grounds, I believe. And unfortunately I think his misstatements were material to his fitness to serve."

If Sessions recused himself from the Russian investigation, the responsibility would fall on the president or Congress to appoint a special prosecutor.

Lynch noted in Congress, Republicans would have to join with Democrats to reach the 218-vote threshold.

"There would be pushback," he said.

You can listen to the interview live here.