House Democrats are expected to unveil articles of impeachment against President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE during a Tuesday morning press conference, according to two sources familiar with the matter.

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.), Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.), and other relevant committee chairs are expected to make the announcement, the timing of which is a sign that Democrats plan to stay on track with their fast-charging goal of wrapping up the impeachment inquiry into Trump's contacts with Ukraine ahead of the holiday season.

Two sources said Democrats are expected to introduce two articles of impeachment. One of the sources, a senior Democratic aide, said they will be obstruction of Congress and abuse of power. The aide noted, however, that Democrats have not fully closed the door on a third article. Multiple sources also told The Hill they believe the markup of the articles will take place either Wednesday or Thursday, though they noted that the precise time has not been confirmed.

Rep. David Cicilline David Nicola CicillineClark rolls out endorsements in assistant Speaker race Races heat up for House leadership posts The folly of Cicilline's 'Glass-Steagall for Tech' MORE (D-R.I.) told reporters Monday evening that Democrats are "going to work through the night" to determine the exact articles they expect to introduce, though they have been heavily indicating the rough outlines of what they believe are impeachable offenses.

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Last week, Democrats heard from three constitutional scholars who said they believed Trump committed three impeachable offenses: Abuse of power and bribery, obstruction of justice, and obstruction of Congress.

Nadler was tight-lipped after leaving a meeting in Speaker Nancy Pelosi Nancy PelosiPelosi: Trump Supreme Court pick 'threatens' Affordable Care Act Sunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election Will Democrats attempt to pack the Supreme Court again? MORE's (D-Calif.) office ahead of the gathering with members of his panel and declined to comment on how the articles of impeachment would take shape.

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 (D-N.Y.) also declined to say what the announcement would be, but he assumed a more somber tone that suggested serious next steps.

"I think that a lot of us believe that what happened with Ukraine especially is not something that we can just close our eyes to," Engel said as he left Pelosi's office. "This is not a happy day."

News that impeachment articles are imminent comes on the same day that Democrats and Republicans dueled over the propriety of Trump's contacts with Kyiv.

Democrats allege that Trump pressed Ukrainian President Volodymyr Zelensky to commit to opening two investigations that would benefit him politically, including into 2020 political rival former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE. They also say the president withheld the promise of a White House meeting and nearly $400 million in U.S. aid as leverage, all while Trump officials repeated the requests in meetings with Zelensky representatives.

Scott Wong, Cristina Marcos and Mike Lillis contributed.