Sondland, a hotel owner who was appointed after donating to Trump's campaign, said the State Department and White House refused to share documents as he complied with an order to appear before Congress.
The Times, citing conversations with two people briefed on the matter, said Sondland told Pompeo in mid-August about a statement he and another United States diplomat drafted with the help of Ukrainians that they had hoped would get Trump to agree to meet with Ukrainian President Volodymyr Zelensky at the White House.
House Democrats have subpoenaed former and incumbent State Department officials in the impeachment inquiry against Trump.
On the one hand, the longer he stayed, the greater the criticism of his failure to defend the senior diplomats implicated in the Ukraine scandal.
What’s next: Impeachment hearings enter crucial stretch
On Thursday, Fiona Hill, the former National Security Council Russia adviser, is scheduled to appear. Judiciary is expected to hold its own hearings and, eventually, vote on articles of impeachment.
Trump throughout Friday's listening to tweeted that "everywhere Marie Yovanovitch went turned bad", inflicting widespread consternation within the room with the previous ambassador calling the president's intervention "very intimidating".
Pompeo also suggested that he understood the reasons for Yovanovitch's abrupt removal in May. Pompeo said that the change was made to enable some wicked objective.
Trump is facing an impeachment inquiry over allegations he withheld United States military aid so he could press Ukraine to dig up dirt on domestic rival Joe Biden.
In response to the White Home, Trump instructed Ukraine's president, Volodymyr Zelensky, by phone that "that woman" - Yovanovitch - was "bad news" and that she was "going to go through some things".
Trump's relationship with Pompeo, who vocally defends his global policy and faithfully, has been seen as unbreakable.