By his own admission, Trump told Ukrainian President Volodymyr Zelensky that "we don't want our people like Vice President Biden and his son [adding to] the corruption already in the Ukraine".
Later Monday, Trump denied telling the Ukraine president that his country would only get US aid if it investigated Biden's son.
The officials were instructed to tell lawmakers the freeze was due to an "interagency process", but to provide no additional information, the Post said.
At the same time, Trump acknowledged on Tuesday that he had suspended US assistance to Ukraine before the phone call. But they have not provided evidence of illegal actions.
Moments before Pelosi spoke, Trump tweeted that he had authorized the release on Wednesday of a transcript of the call.
Pelosi was scheduled to meet with party members Tuesday afternoon.
In June, two months after Joe Biden launched his 2020 campaign for president, The New Yorker published what many saw as a pre-emptive inoculation against his son's many troubles that might damage Biden's campaign.
Trump ordered delay in $400 military aid to Ukraine before call
Trump on Sunday said that he did indeed discuss Biden with Ukraine's president - at a time when the country was awaiting the aid package from the United States - but he denied doing anything improper.
By educating the public, Democrats might move the polls in favor of impeachment, giving protection to Democrats in swing districts and states, which in turn will increase pressure on Republicans.
"On impeachment, what we're seeing - and they're speaking very publicly about this on the record to many of you - that their first effort at impeachment seems not to have worked", Cheney told reporters at the time.
"If the President asked or pressured Ukraine's president to investigate his political rival, either directly or through his personal attorney, it would be troubling in the extreme", Romney, the 2012 Republican presidential nominee, said in a Twitter post.
Senate Minority Whip Dick Durbin, D-Ill., said he was unaware of Democratic outreach to Republicans.
"They're hoping they have something here".
PRESIDENT DONALD TRUMP: The one who's got the problem is Biden 'cause you look at what Biden did - Biden did what they would like to have me do, except for one problem - I didn't do it.
"The Republican-led Senate has remained silent and submissive, shying away from this institution's constitutional obligation to conduct oversight", Schumer wrote in the letter.
Lawyers from the White House counsel's office and the Justice Department had been strongly pushing the president to release a copy of the transcript because they believe it will show he did not act improperly, a person familiar with the matter said. In response, Majority Leader Mitch McConnell (R-KY) accused Schumer and Schiff of politicizing Congress' work in the intelligence space.
Schumer and other Democrats turned up the pressure on their GOP colleagues months after 12 Senate Republicans voted to end the emergency declaration and the House failed to override President Donald Trump's veto.
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