House Democrats are charging ahead with their impeachment inquiry into abuse-of-power allegations against 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, creating the very real possibility that impeachment articles could be drafted — and voted upon — before year's end.

Behind 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.), Democrats have latched on to the recent revelation, brought to light by an anonymous whistleblower complaint, that Trump had threatened to withhold U.S. military aid to Ukraine unless the country's leaders investigated corruption allegations against 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 and his son Hunter Biden.

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The notion that Trump had pressed a foreign leader to investigate a chief political rival amid his high-stakes reelection campaign sparked an uproar within the Democratic Caucus, prompting new calls for impeachment across the party's ideological spectrum and leading Pelosi last week to endorse a formal impeachment inquiry focused on the Ukraine episode.

The House Intelligence Committee, led by Rep. 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.), has taken the lead.

Against that backdrop, here's how the impeachment process works.

An overview

The Constitution allows Congress to remove presidents and other “civil officers” who are found to have committed “treason, bribery, or other high crimes and misdemeanors.” The document is silent, however, on what constitutes “high crimes and misdemeanors,” lending broad discretion to would-be authors of impeachment articles, who are not limited to conduct that violates criminal statutes.

The process is a two-step dance beginning in the House, which has “sole Power of impeachment.” The passage of impeachment articles through the lower chamber essentially represents an indictment. Afterward, that indictment moves to the Senate, which acts as a jury presiding over the impeachment trial. To convict, and remove a president, requires a two-thirds majority of those present within the 100-member Senate.

Impeachment is exceedingly rare. Trump is only the fourth president in the nation's history to be subject to the process — and the first to be targeted over national security concerns. Andrew Johnson was impeached by the House in 1868, and Bill Clinton William (Bill) Jefferson ClintonHarris: Ginsburg 'absolutely' cleared the path for me Anxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report MORE in 1998. Neither was convicted by the Senate, and both served out their terms.

Richard Nixon, facing several impeachment charges, resigned in 1974 before the House could vote on the measures.

Launching the process

There's been plenty of dispute over when — or even whether — Democrats began the impeachment process. 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.) was citing impeachment going back to July, as part of court filings designed to dislodge disputed information related to the Mueller report from an uncooperative White House.

But Pelosi, for months, had avoided the “I-word” for fear of the political harm it might do vulnerable Democrats in battleground districts. That changed Sept. 24, after details of the Ukraine affair began to surface and the Speaker endorsed a formal impeachment inquiry.

Notably, however, Democrats have not staged a floor vote to launch their inquiry — a decision breaking with both the Nixon and Clinton proceedings, when the full House first voted to direct the Judiciary Committee to begin the process. That's fueled criticisms from Trump's Republican allies that Democrats are only feigning impeachment to energize liberal voters ahead of 2020 — a characterization Pelosi and Nadler have disputed.

“There's no requirement that there be a floor vote,” Pelosi told reporters in the Capitol Wednesday.

Committee role

The Judiciary Committee has jurisdiction over impeachment, and it’s there that the process was centered in the Nixon and Clinton eras. Some Democrats have also pushed for the creation of a special committee dedicated solely to impeachment — an idea party leaders have thus far dismissed.

While the Judiciary panel has led the impeachment-related investigations into Trump for much of the year — largely revolving around former 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 probe into Russia’s 2016 election interference — Pelosi broadened the scope of the impeachment investigation last week, extending it to five other committees. Of the six panels, Intelligence is leading the charge, although the Oversight and Reform and Foreign Affairs committees are also examining parts of the Ukraine episode.

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The ongoing investigations are more reminiscent of the Nixon proceedings — which involved a months-long Judiciary investigation before impeachment articles were drafted — than the Clinton affair, when Judiciary Republicans leaned heavily on the report authored by independent counsel Ken Starr.

Pelosi has made it clear that Democrats have some investigating left to do before — or if — they draft articles.

“We have to be fair to the president and that is why this is an inquiry and not an outright impeachment,” Pelosi said Wednesday. “We have to give the president his chance to exonerate himself.”

Reporting articles

While the Intelligence panel currently has the impeachment baton, leaders of the Judiciary Committee have said the process will shift back to them, in the form of recommendations from the other panels for specific impeachment articles, which Judiciary would then draft and move to the floor.

The markup of impeachment articles follows the same protocols governing any other legislation, according to the Congressional Research Service, meaning the vote would require only a simple majority on a panel where Democrats enjoy a stark numbers advantage: 24 to 17.

House vote

Impeachment articles reported by the Judiciary Committee are considered privileged, allowing Nadler to stage a floor vote virtually at will. Democrats, in such a case, could choose to vote on the articles as a package, or divide them into separate votes, as was the case surrounding the Clinton affair.

For the House, passage of impeachment articles would require only a simple majority of the chamber. If even just one article passes, the president has been impeached.

The Senate

Any articles that pass through the House then move to the Senate, which acts as “a High Court of Impeachment,” according the Senate's official website. First, however, senators must adopt a set of rules governing the process — rules that will determine how long the trial will run, what evidence is permissible and which witnesses are allowed.

To argue their case for impeachment, House Democratic leaders would appoint a slate of “managers,” who would essentially act as prosecutors in the trial. The president would appoint a team of defense lawyers to make his case. The Senate is effectively the jury. And presiding over the process would be the chief justice of the Supreme Court, John Roberts.

There is some controversy about whether the Constitution requires the Senate to conduct such a trial. But Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.) erased the uncertainty on that question this week, saying he is obliged to do so.

“I would have no choice but to take it up,” McConnell told CNBC on Monday.

With Republicans controlling the upper chamber — and a two-thirds majority of those present required to convict — the threat of Trump's removal is dim, at best. Yet the vote could prove difficult for vulnerable GOP senators, caught between their allegiance to a president who remains enormously popular among Republicans, and the perils of alienating more centrist voters as they seek reelection in battleground states.