House Speaker Nancy Pelosi (D-Calif.) announced a formal impeachment inquiry of President Trump on Sept. 24. Here’s what you need to know about what impeachment is and how it works, starting with the basics.

What does impeachment actually mean?

It means that Congress thinks the president is no longer fit to serve and should be removed from office.

Who can impeach the president?

Congress. Specifically, the House of Representatives. Under the framework of the Constitution, the House can vote to impeach a president for “high crimes and misdemeanors.” It’s up to the House to decide what that means.

But impeaching the president is not the same thing as removing the president from office. For that, the Senate holds a trial presided over by the chief justice of the United States.

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So wait, is impeachment happening?

No. There’s an impeachment inquiry happening. If lawmakers decide there is enough evidence to consider writing up articles of impeachment, then they will. At which point, impeachment will be underway. The difference may sound semantic, but it’s important to note that a majority of House Democrats support an impeachment inquiry. We don’t know how many would vote to actually impeach Trump. So far only 27 have publicly said they want him impeached.

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What is an impeachment inquiry?

It is the first step in the impeachment process. It means lawmakers will investigate what, if any, “high crimes and misdemeanors” Trump may have committed.

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What is the process for an impeachment inquiry?

Pelosi said when she announced the inquiry that the six key committees that are already investigating the president will continue to investigate Trump “under that umbrella of impeachment inquiry.” If the investigations conclude that there are reasons for impeachment, the House Judiciary Committee will draw up articles of impeachment, and the Judiciary Committee and then the full House will vote on it.

Here’s how Judiciary Committee Chairman Jerrold Nadler (D-N.Y.) summed up the process in August to CNN, when he decided his committee was launching an impeachment inquiry: “We are investigating all the evidence, gathering the evidence. And we will [at the] conclusion of this — hopefully by the end of the year — vote to vote articles of impeachment to the House floor. Or we won’t. That’s a decision that we’ll have to make. But that’s exactly the process we’re in right now.”

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So the House was already in an impeachment inquiry?

Yes. Well, kind of. It depends on whom you ask. Nadler’s committee has charge over impeachment, and he surprised some of his members this summer when he publicly said they’ve started an inquiry. Pelosi was not supportive of this and as recently as mid-September, would not say “impeachment inquiry” publicly. But the allegations facing Trump on Ukraine changed her mind.

What does the whistleblower complaint have to do with impeachment?

The existence of the complaint that Trump abused his power to help his reelection is what motivated Pelosi and other top Democrats to embrace an impeachment inquiry after months of resisting it.

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When Pelosi endorsed an impeachment inquiry on Tuesday, Congress had not seen the full complaint, but she pointed to the assertion by the inspector general of the intelligence community that the complaint is “credible” and “urgent.” She also indicated that the Trump administration’s decision not to immediately share the complaint with Congress was reason enough to consider impeachment.

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“The actions of the Trump presidency revealed a dishonorable fact of the president’s betrayal of his oath of office, betrayal of our national security and betrayal of the integrity of our elections,” she said Tuesday.

What does the readout of Trump’s call with the Ukrainian president have to do with impeachment?

It means Democrats are moving forward with their impeachment inquiry with conviction. But it does not mean Trump is going to be removed from office.

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The Washington Post’s Robert Costa reports that privately, some Senate Republicans are mystified that Trump released the rough transcript at all because it does not exonerate the president. Still, Republicans have publicly stood by Trump this long over several controversies, so why abandon him now?

How many Democrats support an impeachment inquiry?

According to a Washington Post count, at least 224 House Democrats do, which is more than two-thirds of all House Democrats. That number is potentially significant because it takes 218 votes in the House to pass something. Not all of those 200-plus Democrats would vote for impeachment, though. It depends on what evidence the inquiry turns up.

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Still, the number in favor of an impeachment inquiry has been growing steadily since April, when special counsel Robert S. Mueller III released his redacted report on Russian election interference and Trump. That has been despite Pelosi’s efforts to tamp down on impeachment because she feared it could cost vulnerable House Democrats their seats and maybe even cost the party the White House.

Since Congress came back from recess in September, the number of House Democrats who support an inquiry has ticked up by the week, sometimes by the day, and with the whistleblower allegations, by the hour. In the day before and on the day of Pelosi’s embrace of it on Tuesday, 57 House Democrats on the fence came out in support of an impeachment inquiry into Trump.

How long does the impeachment process take?

It can be as long or as short as the House wants. As The Fix’s Aaron Blake notes, if past is precedent, this could be wrapped up in four months. But Democrats probably are on a tight timeline here. Pelosi wants to act while there’s momentum. Politically, it could be much more difficult to make their case that impeachment is necessary if it’s 2020 and nearing an election in which Trump could get thrown out of office anyway.

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What does the Constitution say about impeachment?

It’s in Article II of the Constitution, which sets up the presidency and executive branch but also lays out a way to remove the president. The key clause is: “The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors.”

“High crimes and misdemeanors” is the phrase you will hear invoked frequently as the bar lawmakers are using to determine whether an action is impeachable. It is generally understood to mean a violation of oath of office, not necessarily a crime in the traditional sense of breaking the law. That means there doesn’t have to be clear evidence of a crime for Congress to impeach the president.

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Which presidents have been impeached?

Two presidents in American history have been impeached: Andrew Johnson and Bill Clinton; and Richard M. Nixon resigned under the threat of impeachment. None actually has been removed from office.

Will the Senate remove Trump from office?

As it stands now, probably not. There’s no evidence that the Republican-controlled Senate wants to confront Trump in such a way. In fact, on Monday, Senate Republicans were trying to defend Trump. It’s up to House Democrats to uncover something that could change Republicans’ minds.

But the Senate will have to hold a trial and vote on whether to acquit or convict Trump. “I would have no choice but to take it up,” Senate Majority Leader Mitch McConnell (R-Ky.) told CNBC on Monday.

What does the public say about the impeachment inquiry?

As the Ukraine allegations were coming to light, a Quinnipiac University poll showed that a majority of Americans, 57 percent, didn’t support impeachment.

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A CBS News-YouGov poll published Sunday, after a redacted version of the whistleblower complaint was publicly released, found that more than half of Americans, 55 percent, approve of the fact that Congress has opened an impeachment inquiry into Trump.

What’s Trump saying about the impeachment inquiry?

This:

Or, as the the Post’s White House bureau chief Phillip Rucker described it, Trump’s sense of victimhood is on full display as the impeachment inquiry intensifies.

As Trump tells it, he is a hard-working and honorable president whose conduct has been “perfect” but who is being harassed and tormented by “Do Nothing Democrat Savages” and a corrupt intelligence community resolved to perpetuate a hoax, defraud the public and, ultimately, undo the 2016 election.

Could Trump run in 2020 even if he’s impeached?

If he is impeached by the House, yes. If he is removed from office, well, that’s never happened before, so we’d probably all be armchair-interpreting the Constitution to figure that one out.

JM Rieger contributed to this analysis.

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