WASHINGTON, Nov 27 — The US House of Representatives Judiciary Committee yesterday invited President Donald Trump to its first impeachment hearing, scheduled for December 4, starting a new phase of the inquiry that could lead to formal charges against the president within weeks.

Trump is not required to attend the hearing. But the move allows the president and his legal team access to congressional impeachment procedures that he and other Republicans have denounced as unfair, partly because the White House has not been able to call or cross-examine witnesses.

The House Intelligence Committee, which has led the impeachment investigation through weeks of closed-door testimony and televised hearings, is expected to release a formal evidence report shortly after lawmakers return to Congress on December 3 from their Thanksgiving recess.

The Judiciary panel will use the report to consider formal charges that it could recommend for a full House vote by mid-December. It gave Trump until 6pm (2300 GMT) on Sunday to advise the committee on whether he would attend the hearing, and to indicate by then who would be his counsel.

The White House did not immediately respond to a request for comment.

Representative Jerrold Nadler, the Judiciary Committee's Democratic chairman, told Trump in a letter that he was reminding the president that the committee's rules allow him to attend the hearing and for his legal team to question witnesses.

The hearing, scheduled to begin at 10am (1500 GMT), will have legal experts, who have not yet been identified, as witnesses.

"The president has a choice to make: He can take this opportunity to be represented in the impeachment hearings, or he can stop complaining about the process,” Nadler said in a statement. "I hope that he chooses to participate.”

In his letter, Nadler said the hearing was intended as an opportunity to discuss the historical and constitutional basis of impeachment, as well as the meaning of terms like "high crimes and misdemeanors.”

"We will also discuss whether your alleged actions warrant the House's exercising its authority to adopt articles of impeachment,” Nadler wrote.

Trump denies wrongdoing and has dismissed the inquiry as a sham by Democrats who want to overturn the result of the 2016 US presidential election.

House Republican Conference Chairwoman Liz Cheney tweeted that Democrats "have decided to give @realDonaldTrump the right to question liberal law professors, but not any fact witnesses. At all.”

Year-end timetable

The Democratic-led House is aiming to resolve the question of Trump's impeachment before the end of the year, possibly by approving formal charges known as articles of impeachment and forwarding them to the Republican-controlled Senate for a trial that could begin in January.

A trial would determine whether Trump should be convicted and removed from office. But Senate Republicans have shown little inclination to remove Trump, their party's leader, who is seeking re-election in 2020.

The inquiry centres on a July 25 phone call in which Trump asked Ukrainian President Volodymyr Zelenskiy to investigate political rival Joe Biden and his son Hunter Biden as well as a discredited conspiracy theory promoted by Trump that Ukraine, not Russia, interfered in the 2016 US presidential election.

Joe Biden is now a leading contender for the 2020 Democratic presidential nomination. Hunter Biden had worked for a Ukrainian energy company while his father was vice president under Democratic President Barack Obama.

Democrats have accused Trump of abusing his power by withholding US$391 million (RM1.63 billion) in security aid to put pressure on a vulnerable US ally to interfere in an American election by digging up dirt on his domestic political opponents.

Yesterday, the House Intelligence Committee released transcripts of closed-door testimony from Mark Sandy, a career official with the White House Office of Management and Budget, and Philip Reeker, acting assistant secretary of state for European and Eurasian affairs.

In his testimony, Sandy, one of the only current White House aides to agree to testify to congressional investigators, said a budget office attorney and another staffer in that office resigned partly because of concerns over the hold on US military aid to Ukraine.

Reeker in his testimony discussed the "irregular" role three officials close to Trump — the ambassador to the European Union and Trump donor Gordon Sondland, Energy Secretary Rick Perry and Trump's personal attorney, Rudy Giuliani — played in US policy toward Ukraine.

A Reuters/Ipsos opinion poll released yesterday found support for impeaching Trump tracked higher over the past few weeks of televised impeachment hearings. According to the poll, which split largely along party lines, 47 per cent of respondents believed Trump should be impeached and 40 per cent were opposed. — Reuters