House Democratic chairmen who cast votes in favor of impeaching President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE while Republicans controlled the chamber now say it’s too soon to hit the gas on starting impeachment proceedings.

The senior Democratic lawmakers, who voted in favor of impeachment articles from Rep. Al Green Alexander (Al) N. GreenThe Memo: Trump's race tactics fall flat Trump administration ending support for 7 Texas testing sites as coronavirus cases spike The Hill's Coronavirus Report: Miami mayor worries about suicide and domestic violence rise; Trump-governor debate intensifies MORE (D-Texas) in the last Congress, are largely toeing their leadership’s line of caution, saying committees should move forward with investigations of Trump.

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The committee leaders who voted in favor of Green's impeachment articles in 2017 and 2018 either once or both times include Foreign Affairs Committee Chairman Eliot Engel Eliot Lance EngelHouse panel halts contempt proceedings against Pompeo after documents turned over Engel subpoenas US global media chief Michael Pack The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (N.Y.), Homeland Security Committee Chairman Bennie Thompson Bennie Gordon ThompsonHouse panel pans ICE detention medical care, oversight Senate to hold nomination hearing for Wolf next week Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers MORE (Miss.), Rules Committee Chairman Jim McGovern (Mass.), Science Committee Chairwoman Eddie Bernice Johnson Eddie Bernice JohnsonHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll House passes legislation to boost election security research 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 (Texas), Energy and Commerce Committee Chairman Frank Pallone Jr. Frank Joseph PallonePharma execs say FDA will not lower standards for coronavirus vaccine Dem chairmen urge CMS to prevent nursing homes from seizing stimulus payments Federal watchdog finds cybersecurity vulnerabilities in FCC systems MORE (N.J.), Small Business Committee Chairwoman Nydia Velázquez (N.Y.) and Natural Resources Committee Chairman Raúl Grijalva (Ariz.).

Engel and Financial Services Committee Chairwoman Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.) are both leading investigations of Trump; Waters is notable in having called for Trump’s impeachment before and after the release of special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s report.

Engel, who backed impeachment in separate votes in 2017 and 2018, echoed Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) during a conference call earlier this week with Democrats.

Engel said that Democrats “should be cautious” with impeachment, according to a source on the call, while explaining how his panel is investigating Russian interference.

“We need to look at this bizarre relationship between Putin and Trump,” Engel said during the call.

He added that he’s directing staff to inform foreign governments that do business with Trump hotels that they may be contributing to a violation of the Constitution's Emoluments Clause, which is an issue that progressives like billionaire activist Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE have cited in calling for impeachment.

Johnson, who also voted in favor of Green’s impeachment resolution, took a similar tack.

“Impeachment is a sacred constitutional responsibility entrusted to Congress. I am committed to continuing to conduct oversight into the president’s conduct and wrongdoing as well as serving as a check on the president. This is what House Democrats were elected into the majority to do, and this is what we will do while Senate Republicans repeatedly show that they are willing to look the other way,” Johnson said in a statement.

McGovern deferred to the Judiciary Committee but didn't rule out the prospect of impeachment.

"He trusts Chairman [Jerrold] Nadler’s leadership on this issue. But given Special Counsel Mueller’s report and the president’s continued stonewalling of Congressional oversight requests, he doesn’t believe any options should be taken off the table," McGovern spokesman Matt Bonaccorsi said.

Two members of Democratic leadership who, like Green, are members of the Congressional Black Caucus, at one point or another supported the efforts. Green alleged in his articles of impeachment that Trump was inflaming racial tensions in America.

House Majority Whip James Clyburn (D-S.C.) voted in favor of Green's articles of impeachment in 2017 but joined other Democratic leaders the second time in voting to table them. The votes forced by Green drew the support of 58 Democrats the first time and 66 a month later, but the majority of his colleagues joined leadership in rejecting the efforts.

“His vote in 2017 was to express his disapproval of the president on the record,” Clyburn spokeswoman Hope Derrick said.

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House Democratic Caucus Chairman Hakeem Jeffries Hakeem Sekou JeffriesDemocratic leaders: Supreme Court fight is about ObamaCare Pelosi: House will stay in session until agreement is reached on coronavirus relief Races heat up for House leadership posts MORE (D-N.Y.), voted to table Green's articles the first time but voted in favor of them in January 2018 after Trump came under fire for deriding protections for immigrants from “shithole” African countries.

Democratic chairmen face some pressure to back Pelosi, who has argued it would be unwise to move forward with impeachment given the likelihood that the Republican Senate would not convict Trump. Pelosi also remembers how impeachment boomeranged on House Republicans in the Clinton era.

Most of the calls to move forward on impeachment have come from liberal members of the Democratic caucus. Pelosi is worried impeachment could be used by Republicans against many of the vulnerable Democrats who won swing districts in 2018.

Waters is one committee chair who backed Green’s call for impeachment when Democrats were in the minority, and has kept her position in the majority.

In the wake of Mueller’s report, she said she still supports impeachment.

“Mueller kicked the impeachment ball to the Congress. The Constitution gives the responsibility to Congress to impeach an unfit president — 'high crimes and misdemeanors.' What more do we need? #impeach45,” Waters wrote in a series of tweets this week.

She also made a point of noting that impeachment is in House Judiciary Committee Chairman Jerry Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE's (D-N.Y.) court, writing that “Dems divided. The impeachment resolution must start with & be taken up by the Judiciary Committee. Rep. Nadler is the Chairman of the Judiciary Committee.”

Nadler, as well as Oversight and Reform Committee Chairman Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.) and Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer MORE (D-Calif.), did not vote in favor of Green's efforts.

Thompson, meanwhile, notably retweeted a message from Green last week calling for impeachment. A spokesman for Thompson did not return requests for comment.

Other committee leaders who voted in favor of Green's articles in the past avoided mentioning the word impeachment at all when reacting to the release of Mueller's report and instead joined calls for the full, unredacted version of the special counsel's findings. Both Pallone and Velazquez cast doubt on Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE and said they wanted to see Mueller testify before Congress.

Grijalva, meanwhile, indicated that impeachment isn't a realistic option compared to asking voters to make the decision whether to oust Trump.

“Election time is when you beat Trump,” Grijalva told Politico.

Green told The Hill that he's waiting to see what the Judiciary Committee does next before forcing a third vote on impeachment, which he’s threatened since February.

Green has cosponsored articles of impeachment from Rep. Brad Sherman Bradley (Brad) James ShermanSherman joins race for House Foreign Affairs gavel Castro launches bid for House Foreign Affairs gavel The Hill's Morning Report - Presented by Facebook - Trump, GOP senators at odds over next stimulus bill MORE (D-Calif.) arguing that Trump obstructed justice by firing James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE as FBI director as well as a resolution from Rep. Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.) calling on the House Judiciary Committee to investigate whether Trump has committed impeachable offenses. But Green has yet to unveil a new impeachment resolution of his own this year.

“I'm going to give the committee an opportunity to act,” Green said in a phone interview. “But if the committee doesn't act, I'm not going to let my record show that a president who was unfit, who has obstructed justice, is above the law.”

Green said that he's not lobbying colleagues on impeachment, saying that “under these circumstances, it is better to stand alone than not stand at all.”

Scott Wong contributed.