Speaker Nancy Pelosi says the House of Representatives will file impeachment charges against US President Donald Trump for alleged abuse of power.

"Our democracy is what is at stake, the president leaves us no choice but to act," the top elected Democrat said.

Mr Trump said Democrats have "gone crazy" and urged them to move quickly if they were going to impeach him.

Democrats say Mr Trump corruptly made military aid to Ukraine conditional on it investigating his rival Joe Biden.
What did Pelosi say?

The California congresswoman told Thursday morning's news conference: "The facts are uncontested. The president abused his power for his own political benefit at the expense of our national security, by withholding military aid and a crucial Oval Office meeting in exchange for an announcement for an investigation into his political rival."

An impeachment vote might take place in the House of Representatives before the end of the year, and a trial in the Senate perhaps as early as January 2020.
In a later news conference, Mrs Pelosi upbraided a reporter who asked whether she hated the president.
"I don't hate anybody," she said, invoking her Catholic faith after striding back to the podium.
"I still pray for the president all the time. So don't mess with me when it comes to words like that!"
What did the White House say?
Mr Trump tweeted shortly before Mrs Pelosi's remarks: "If you are going to impeach me, do it now, fast, so we can have a fair trial in the Senate, and so that our country can get back to business."

Meanwhile, in a series of blistering tweets, Donald Trump has indicated he's ready for the coming battle.

American voters will eventually have their say in November, but it will only be after months of bitter partisan warfare over the presidency itself.

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