House Speaker Nancy Pelosi launched a formal impeachment inquiry against President Donald Trump on Tuesday, acquiescing to mounting pressure from fellow Democrats and plunging a deeply divided nation into an election year clash between Congress and the commander in chief.

The probe centers on whether Trump abused his presidential powers and sought help from a foreign government for his reelection. Pelosi said such actions would mark a "betrayal of his oath of office" and declared: "No one is above the law."

Pelosi's brief statement capped a frenetic stretch on Capitol Hill, as details of a classified whistleblower complaint about Trump burst into the open and momentum shifted swiftly toward an impeachment probe. The charge was led by several moderate Democratic lawmakers from political swing districts, many of them with national security backgrounds and serving in Congress for the first time.

After more than two and one-half years of sharp Democratic criticism of Trump, the formal impeachment quest sets up the party's most urgent and consequential confrontation with a president who thrives on combat — and injects deep uncertainty in the 2020 White House race. Trump has all but dared Democrats to take this step, confident that the specter of impeachment led by the opposition party would bolster his political support

Trump, who was meeting with world leaders at the United Nations, previewed his defense in an all-caps tweet: "PRESIDENTIAL HARRASSMENT!"

Pelosi had barely finished speaking as he began a mini-blizzard of tweets assailing her announcement.

At issue are Trump's actions with Ukraine. In a summer phone call with Ukraine President Volodymyr Zelenskiy, he is said to have asked for help investigating Democrat Joe Biden and his son Hunter. In the days before the call, Trump ordered advisers to freeze $400 million in military aid for Ukraine — prompting speculation that he was holding out the money as leverage for information on the Bidens. Trump has denied that charge, but acknowledged he blocked the funds.

Ahead of Pelosi's announcement, Trump authorized the release of a transcript of his call with Ukraine's president, predicting it would show no evidence of wrongdoing. The transcript is to be made public on Wednesday.

"You will see it was a very friendly and totally appropriate call," Trump said.

Trump has sought to implicate Biden and his son in the kind of corruption that has long plagued Ukraine. Hunter Biden served on the board of a Ukrainian gas company at the same time his father was leading the Obama administration's diplomatic dealings with Kyiv. Though the timing raised concerns among anti-corruption advocates, there has been no evidence of wrongdoing by either the former vice president or his son.

While the possibility of impeachment has hung over Trump for many months, the likelihood of a probe had faded after special counsel Robert Mueller's investigation ended without a clear directive for lawmakers. Democratic House committees launched new inquiries into Trump's businesses and a variety of administration scandals, but all seemed likely to drag on for months.

But details of Trump's dealings with Ukraine prompted Democrats to quickly shift course. By the time Pelosi addressed the nation on Tuesday, about two-thirds of House Democrats had announced moving toward impeachment probes.

After Pelosi's Tuesday announcement, the president and his campaign team quickly released a series of tweets attacking Democrats, including a video of presidential critics like the speaker and Rep. Ilhan Omar discussing impeachment. It concluded with a message for the Trump faithful: "While Democrats 'Sole Focus' is fighting Trump, President Trump is fighting for you."

Pelosi has for months resisted calls for impeachment from her restive caucus, warning that it would backfire against the party unless there was a groundswell of public support. That groundswell hasn't occurred, but Pelosi suggested in comments earlier Tuesday that this new episode — examining whether a president abused his power for personal political gain — would be easier to explain to Americans than some of the issues that arose during the Mueller investigation and other congressional probes.

While Pelosi's announcement adds weight to the work being done on the oversight committees, the next steps are likely to resemble the past several months of hearings and legal battles — except with the possibility of actual impeachment votes.

On Wednesday, the House is expected to consider a symbolic but still notable resolution insisting the Trump administration turn over to Congress the whistleblower's complaint. The Senate, in a rare bipartisan moment, approved a similar resolution Tuesday.

The lawyer for the whistleblower, who is still anonymous, released a statement saying he had asked Trump's director of national intelligence to turn over the complaint to House committees and asking guidance to permit the whistleblower to meet with lawmakers.

Pelosi suggested that this new episode — examining whether a president abused his power for personal political gain — would be easier to explain to Americans than some of the issues that arose during the Mueller investigation and other congressional probes.

The speaker put the matter in stark terms on Tuesday: "The actions of the Trump presidency revealed dishonorable facts of the president's betrayal of his oath of office, betrayal of his national security and betrayal of the integrity of our elections."

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