House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerAttacks against the police are organized and violent This week: House returns for pre-election sprint Hillicon Valley: Twitter flags Trump campaign tweet of Biden clip as manipulated media | Democrats demand in-person election security briefings resume | Proposed rules to protect power grid raise concerns MORE (D-N.Y.) said Wednesday that it is “likely” that the House will issue a subpoena to President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE's former national security adviser John Bolton John BoltonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE.

Nadler said that a final decision had not been made yet, but that the odds were that House Democrats would issue a subpoena after the Senate voted last week not to call any witnesses in Trump’s impeachment trial.

“I think it’s likely, yes,” Nadler told reporters. "We'll want to call Bolton."

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Nadler elaborated that Democrats would continue their investigations even after the Senate's expected vote later Wednesday to acquit Trump on the two articles of impeachment passed by the House.

Nadler defended pursuing further investigations into the White House in an election year.

“First of all, I think when you have a lawless president, you have to bring that to the fore and you have to spotlight that. You have to protect the Constitution, whatever the political consequences. Second of all, no, as more and more lawlessness comes out, I presume the public will understand that," Nadler told reporters outside a Democratic caucus meeting.

But a decision on the House issuing a subpoena to Bolton is not set in stone.

Rep. Hakeem Jeffries Hakeem Sekou JeffriesPelosi: House will stay in session until agreement is reached on coronavirus relief Races heat up for House leadership posts Postmaster general earned millions from company with ties to Postal Service: report MORE (D-N.Y.), the Democratic caucus chairman and one of the seven impeachment managers, said that subpoenaing Bolton would be a “question for further discussion” that would be decided by Speaker Nancy Pelosi Nancy PelosiPowell warns failure to reach COVID-19 deal could 'scar and damage' economy Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE (D-Calif.) and House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffOvernight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings Democrats, advocates seethe over Florida voting rights ruling MORE (D-Calif.).

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Bolton's upcoming book reportedly will claim that Trump wanted to withhold nearly $400 million in security assistance to Ukraine until its government agreed to open investigations into his political opponents.

House Democrats asked Bolton to testify last fall but did not issue a subpoena. Bolton declined to testify because the White House didn't authorize him to appear as a witness in the impeachment inquiry.

Democrats opted against trying to force Bolton to testify out of concerns that the fight would take months to resolve in the courts.

But in January, Bolton announced that he would be willing to testify in the Senate impeachment trial if he were subpoenaed. Senators, however, narrowly voted last week against calling any witnesses.

House Majority Leader Steny Hoyer Steny Hamilton HoyerDemocrats scramble on COVID-19 relief amid division, Trump surprise The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep Coons beats back progressive Senate primary challenger in Delaware MORE (D-Md.) suggested on Wednesday that there is value in hearing from Bolton, even after the Senate impeachment trial has ended. But he deferred the decision to the committee leaders, like Nadler, who have been examining Trump's dealings with Ukraine.

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"I don't think they're going to be precluded by any vote of the Senate on that," Hoyer told reporters in the Capitol. "But the committees will make that decision."

Hoyer acknowledged that there are some moderate Democrats facing tough reelections who are ready to put the whole saga behind them and turn their focus to legislation. But, he predicted voters will understand if Democrats frame the ongoing investigation as routine oversight, rather than a second stab at impeachment.

"The committees ... will be making a determination whether that information is useful to get for their oversight responsibilities, not necessarily for the impeachment process, but for ... closing the book, finding out the information," he said. "I think that they may well do that, but they're going to make that decision."

--Mike Lillis contributed to this report, which was updated at 12:20 p.m.