"The President could come right before the committee and speak all the truth he wants if we wants to take the oath of office or he could do it in writing".
That appeared to represent an increase from before the hearings in the House Intelligence Committee began Wednesday.
Multiple witnesses overheard a phone call in which Mr Trump and Mr Sondland reportedly discussed efforts to push for the investigations.
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 U.S. foreign policy to undermine former Democratic Vice President Joe Biden, one of his potential opponents in the 2020 election.
Trump has said the impeachment process is stacked against him and is nothing more than a "witch hunt".
Penn State vs. Indiana: Prediction, odds, point total, & more
There was a long-awaited reunion outside the Penn State locker room, and KJ Hamler was wound up and at the center of it all. Heading into its game on Saturday against Rutgers, the Buckeyes had not been challenged for four quarters by any opponent.
Morrison told House investigators last month that Gordon Sondland, ambassador to the European Union, was acting at Trump's behest and spoke to a top Ukrainian official about exchanging military aid for political investigations.
The hearings could pave the way for the House to approve articles of impeachment - formal charges - against Trump. I can't imagine a scenario under which President Trump would be removed from office with 67 votes in the Senate.
Fifty-one per cent of those asked said they think Trump should be tried and convicted in the US Senate, while another six per cent favor impeachment but not removal, according to the ABC News-Ipsos poll.
In a pair of tweets, Trump says he will "strongly consider" an offer by House Speaker Nancy Pelosi to testify before the House impeachment panel.
Week 2 Of The Impeachment Inquiry Public Hearings Begins
All of the witnesses testifying have already spoken to investigators in closed depositions, some of them for 10 hours or more. Then fast forward to Ukraine, where the new Ukrainian President spoke unfavorably about her in my second phone call with him.
The latest round of hearings will stretch from Tuesday to Thursday before the House Intelligence Committee.
The historic impeachment hearings kicked off last Wednesday when William Taylor, the top USA diplomat in Ukraine, and Deputy Assistant Secretary of State George Kent testified.
President Trump's former deputy campaign chairman Rick Gates testified during the recently concluded trial of Roger Stone that Trump and Stone had discussed the impending release of information beneficial to Trump's 2016 campaign, around the same time Stone was working to get information from stolen Democratic documents obtained by WikiLeaks.
However, Mr Trump in this case would still be only the third president ever impeached and the fight is likely to have unpredictable fallout in the 2020 election.
I'm a Celebrity fans share disappointment that Holly Willoughby isn't back
And Peter Jones, one of the entrepreneurs on BBC reality show Dragons' Den, also said, "Happy Birthday" with a party popper emoji. McPartlin said the famous contestants were, "sweating" with nerves, prompting pal Donnelly to quip, "Not everyone can sweat".