Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) will announce later Tuesday that she supports a formal impeachment inquiry into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, a Democratic lawmaker close to her confirmed to The Hill.

The move comes amid mounting pressure from House Democrats to take a stand against Trump’s alleged political pressure on Ukraine to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE's son, Hunter Biden, during a July phone call with Ukrainian President Volodymyr Zelensky.

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That call has come under increasing scrutiny over the past several days following the revelation that a whistleblower raised concerns about the discussion between the two leaders.

Pelosi is expected to make her announcement at 5 p.m. on the House floor after meetings with Democratic chairmen of six committees investigating Trump and his administration and with the full Democratic Caucus.

"As soon as we have the facts, we’re ready,” Pelosi said Tuesday at The Atlantic Festival. “Now we have the facts, we’re ready … for later today.”

A source familiar with the Tuesday afternoon meetings said Pelosi will endorse a previous request by House Judiciary Committee Chairman Jerrold 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 (D-N.Y.) that the heads of other committees send the Judiciary panel any oversight information or documents that could help with the investigations.

A lawmaker in one of the Tuesday meetings with Pelosi told The Hill there will not be a separate select committee to oversee or pursue the impeachment inquiry.

More than two-thirds of House Democrats publicly support an impeachment probe. Pelosi has not been among those backing an inquiry.