Mr Trump's July 25 phone call is at the heart of the House of Representatives' Democratic-led inquiry into whether the Republican president misused USA foreign policy to undermine former Democratic Vice President Joe Biden, one of his potential opponents in the 2020 election.
"Even though I did nothing wrong, and don't like giving credibility to this No Due Process Hoax, I like the idea and will, in order to get Congress focused again, strongly consider it", he said in a tweet. Pelosi said lawmakers would "look forward" to seeing any information from Trump "that is exculpatory, that means ex, taking away, culpable, blame".
Mrs. Pelosi also dismissed Republicans' argument that there can not be any quid pro quo if the aid money ultimately flowed and Ukraine never opened investigations.
Pushing back against accusations from the Republican President that the process has been stacked against him, Ms Pelosi said Mr Trump is welcome to appear or answer questions in writing, if he chooses. The whistleblower account of the July 25 call led to Democrats opening the inquiry. Chuck Schumer, the Democratic leader in the Senate, told reporters that if Mr Trump "doesn't like what he's hearing, he shouldn't tweet", but instead "testify under oath".
In the latest development, state department official David Holmes told investigators in closed door testimony on Saturday that he had overheard a USA diplomat telling Mr Trump that Ukraine would carry out investigations the president had asked for.
The ongoing impeachment inquiry has caused a breakdown in President Donald Trump's relationship with Secretary of State Mike Pompeo, typically one of his closest allies in the Cabinet, NBC News reports.
Democrat Peter Welch responded at the time, "I would be glad to have the person who started it all come in and testify".
The week's most anticipated witness may be Ambassador Gordon Sondland, set to appear Wednesday.
Morrison said Sondland and Trump had spoken approximately five times between July 15 and September 11 - the weeks that $391 million in USA assistance was withheld from Ukraine before it was released.
Mr Morrison's testimony contradicted much of what Mr Sondland told congressional investigators during his own closed-door deposition, which the ambassador later amended. In dozens of instances, Mr Trump then said he could not "recall" the facts.