The White House denied Wednesday that its summary of the phone call between President Donald Trump and the president of Ukraine contains omissions at crucial moments when Trump asked the foreign leader to help dig up dirt on political rival Joe Biden .

The document, which is not a verbatim transcript of the call, contains ellipses just after Trump launched into his request that Volodymyr Zelensky do a favor, which raised questions about potentially missing words or phrases:

I would like you to find out what happened with this whole situation with Ukraine, they say Crowdstrike... I guess you have one of your wealthy people The server, they say Ukraine has it.

Biden went around bragging that he stopped the prosecution so if you can look into it It sounds horrible to me.

The first quote is a reference to an unsubstantiated claim being pushed by Trumps personal lawyer Rudy Giuliani that Ukraine played a role in hacking the Democratic National Committee during the 2016 campaign. The consensus among national security agencies places blame for the hack on Russia.

The second quote refers to a debunked claim being pushed by the president that Biden bragged about foiling a corruption probe into a Ukrainian company linked to his son Hunter Biden.

As a punctuation mark, ellipses typically indicate the omission of words or entire sentences from a quote, although they can also indicate when a speaker trails off.

A few hours after the release of the phone call memo, an unnamed White House source said the latter use of ellipses was applied here, the AP reported .

The ellipses do not indicate missing words or phrases. They refer to a trailing off of a voice or pause. If there were missing words or phrases, they would be represented by brackets or redactions. This is the standard practice at the White House, the official said.

The document released by the White House on Wednesday is not a word-for-word recreation of the call but a detailed memo based on notes and recollections of Situation Room Duty Officers and NSC policy staff who are assigned to listen to and take careful notes on the call in real time, a footnote cautions. A senior White House official told reporters that voice recognition software was also used to compile the memo.

On Wednesday, Senate Minority Leader Chuck Schumer signaled that Democrats werent ruling out the possibility that the transcript omitted vital details.

This White House has a history of doctoring public disclosures to save the president from embarrassment, he said in a statement. If they do it for small things, like when they changed the transcript of the White House communications director saying the president sinks three-foot putts into saying he sinks 30-foot putts, then theres no telling what they do in a document as consequential as this one.

He continued, Even with the possibility that the administration doctored or left out major sections, though, this document demonstrates that President Trump made it abundantly and redundantly clear to the president of the Ukraine that he wanted him to investigate his political opponent.

The summary of the July 25 phone call is at the heart of explosive accusations that Trump leveraged United States foreign policy to damage Biden, who is a frontrunner for the 2020 Democratic presidential nomination.

On Tuesday, House Speaker Nancy Pelosi announced the start of a formal impeachment inquiry into Trump as he frustrated Congresss attempts to investigate.

The White House initially resisted releasing a transcript of the call to Congress, as well as a whistleblower complaint that first brought the presidents actions under scrutiny. The White House reportedly plans to release the complaint, which Congress has a right to see by law, and facilitate congressional interviews of the whistleblower.

Earlier this week, Trump attempted to walk back the notion that he pressed Zelensky for his own political gain.

During the call, Trump repeatedly asked Zelensky to contact his personal lawyer, Giuliani, or U.S. attorney general William Barr about opening a corruption probe against Biden.

There is a lot of talk about Bidens son, that Biden stopped the prosecution, and a lot of people want to find out about that, Trump said, according to the phone call memo. So whatever you can do with the attorney general would be great.

The Justice Department claims Barr was unaware of Trumps overtures to Zelensky.

Just days before the call took place, Trump had ordered his acting chief of staff to suspend $391 million in U.S. foreign aid to Ukraine, although the aid does not come up in the memo.

Trump has accused Biden of using his authority while he was vice president to force the dismissal of a Ukrainian prosecutor who was investigating a company with ties to Bidens son.

Trumps accusations, however, are not substantiated. Although Biden called for the prosectors dismissal, he was one of many world leaders and good governance groups to do so, because of that prosecutors storied history of failing to bring corruption cases.

One entity with a history of corruption was Burisma Holdings, where Bidens son Hunter was a paid board member beginning in 2014. But the United States under President Barack Obama actually pushed for a possible investigation into Burisma and its owner, and there is no evidence that Biden interfered.

Hunter Biden has been criticized for the appearance conflict of interest but is accused of no legal wrongdoing.