Here are some key takeaways from the Democratic memo:

The F.B.I. used only a small part of the information provided by Mr. Steele.

The Democratic memo says the application made “narrow use” of information from Mr. Steele’s sources. It describes multiple other categories of information, including yearslong suspicions that Mr. Page was being recruited by Russian spies, and revealed that the F.B.I. had interviewed Mr. Page about his ties to Russian intelligence officials in March 2016.

It also discussed Moscow’s apparent overtures to another Trump campaign official and its general meddling during that period, which prompted the F.B.I. to open the Trump-Russia investigation in late July — before the bureau’s investigative team received Mr. Steele’s information.

Some of that material remains redacted in the version of the memo made public on Saturday.

By contrast, Republicans have portrayed Mr. Steele’s information as the central focus of the application, filed to the United States Foreign Intelligence Surveillance Court. The Republican memo said it formed “an essential part” of the application, and in a separate memo, Senators Charles E. Grassley and Lindsey Graham, Republicans of Iowa and South Carolina, stated that “the bulk” of the application was Mr. Steele’s information.

The Democratic memo also says that what the F.B.I. did use from Mr. Steele did not include the salacious parts of his dossier. Instead, it says, the bureau chiefly relied on the dossier’s claims that Mr. Page had met with a Kremlin official as well as a close associate of President Vladimir V. Putin during a July 2016 trip to Moscow, during which the official offered to provide compromising information about Mrs. Clinton to the Trump campaign.

Notably, the Democratic memo also said that in subsequent renewals of the wiretap application, the Justice Department “provided additional information obtained through multiple independent sources that corroborated Steele’s reporting.”