In it, Trump asked Zelensky to "look into" the allegations that Ukraine helped Hillary Clinton's 2016 campaign and the role Joe Biden had in firing the chief prosecutor who had investigated the Ukrainian gas company that employed Biden's son, Hunter.
Democrats say it shows Mr Trump used the office for personal political gain.
Redacted documents released on Friday by the Office of Management and Budget (OMB) and the Pentagon under a Freedom of Information Act request show that the aid freeze was ordered less than two hours after the 25 July call.
In an email, senior White House official Michael Duffey told Pentagon officials that Trump was personally interested in the Ukraine assistance matter and had ordered to hold it. "Given the sensitive nature of the request, I appreciate your keeping that information closely held to those who need to know to execute the direction", he wrote.
An email from Duffey to Deputy Secretary of Defense David Norquist on July 25, shortly after the Trump-Zelenskiy phone call, expressed uneasiness about the hold.
A rough transcript of that call was declassified by the White House following a whistleblower complaint it was being covered-up.
An OMB spokesperson sought to downplay the significance of the email over the weekend, insisting in a statement that it was "reckless to tie the hold of funds to the [Trump-Zelenksy] call".
Mr Schumer "made clear to Senator McConnell that the witnesses and documents are necessary to ensure a fair trial in the Senate", spokesman Justin Goodman said.
Officials were anxious about the hold from the start, Public Integrity reports.
"To pull a line out of one email and fail to address the context is misleading and inaccurate".
Mr. Duffey wrote an email to Mrs. McCusker at 9:52 p.m. on September 11, saying he expected the signing of the release order to take place that night, and that he was "glad to have this behind us". "This email is explosive", he added at a news conference on Sunday.
The Democratic House majority impeached the President on Wednesday on charges of abuse of power and obstruction of Congress.
Sandy testified that two budget officials resigned in part due to frustration about the freeze, a sentiment that was shared within the Pentagon, according to the emails.
"It doesn't have to be an either-or", Short said on Fox News Sunday when Wallace asked if President Trump would ask Donald John TrumpClyburn the White House: "I won't be intimidated" for Trump as headlining evangelicals in the new Brazilian Bolsonaro says Trump will not pursue steel, aluminum tariffs MORE continue to believe Ukraine has interfered in the elections.
Mr Murphy later seemed to concede that the documents, while important, were just the latest piece of evidence in a months-long inquiry spearheaded by House Democrats that still seems certain to end in Mr Trump's acquittal by the Republican-controlled Senate, some time in early 2020.