US House panel approves two articles of impeachment charging Trump with abuse of power and obstruction of Congress.

US Democrats on Friday approved two articles of impeachment against Donald Trump, charging the president with abuse of power and obstruction of justice.

The articles of impeachment now go to the full House of Representatives, which is expected hold a vote next week.

Democrats say the formal charges are related to Trump’s effort to pressure Ukraine to investigate a political rival.

The House Judiciary Committee vote came after weeks of public hearings before the House Intelligence Committee, a 300-page report and divisive rhetoric highlighting the political divide that has come to define the impeachment process.

With Democrats moving forward with impeachment charges, here is a quick guide to how impeachment works and what happens next.

1. What is impeachment?

The founders of the United States included impeachment in the US Constitution as an option for removal of presidents by Congress.

They agreed that presidents could be removed if found guilty by Congress of “treason, bribery or other high crimes and misdemeanours”.

2. What are articles of impeachment?

The sole authority under the Constitution to bring articles of impeachment is vested in the House of Representatives where proceedings can begin in the Judiciary Committee. If the House approves articles of impeachment, or formal charges, he or she would then be subject to trial in the US Senate.

In the context of Trump, Democrats first pursued a two-month inquiry, led by the House Intelligence Committee, which submitted a 300-page report about its findings earlier this month.

Democrats have accused Trump of abusing his power of office and obstruction of Congress.

Speaker of the House Nancy Pelosi makes a statement at the Capitol in Washington [File: J. Scott Applewhite/AP Photo]

The inquiry is centred on a July phone call in which Trump asked Ukrainian President Volodymyr Zelenskyy to launch an investigation into former Vice President Joe Biden, a 2020 presidential frontrunner, and his son Hunter, who served on a board of a Ukrainian gas company. Trump also wanted an investigation into a debunked conspiracy theory that Ukraine, not Russia, interfered in the 2016 elections.

At the time of the call, the Trump administration was withholding nearly $400m in military aid from Ukraine.

Trump has denied any wrongdoing, calling the impeachment inquiry a hoax. The president and his White House have refused to participate in the inquiry, instructing members of his administration to do the same.

Trump, a Republican, “sees himself as above the law,” said Judiciary Committee Chairman Jerrold Nadler. “We must be clear, no one, not even the president, is above the law.”

3. What happens next?

The full House is expected to hold a vote next week on whether to impeach Trump.

Impeachment in the 435-member House must be approved with a simple majority.

If the House votes to impeach, the matter moves to the Senate, where a trial is held. The chief justice of the Supreme Court presides over the trial.

A two-thirds majority vote is required in the 100-member Senate to convict and remove a president from office.

The Senate is made up of 53 Republicans, 45 Democrats and two independents who caucus with the Democrats. At this point, no Republicans have indicated they will vote against the president should a trial take place.

4. Who would become president if Trump was removed?

A Senate conviction that removed Trump from office would automatically elevate Vice President Mike Pence to become president, completing Trump’s term, which ends on January 20, 2021.