Attorney General William Barr testified before a House subcommittee Tuesday, marking his first appearance before lawmakers on Capitol Hill since releasing his four-page memo on the key findings of Special Counsel Robert Mueller's investigation into Russian interference in the 2016 election.

The official purpose of the hearing, which was conducted by the House Appropriations Commerce, Justice, Science, and Related Agencies Subcommittee, was to discuss Barr's fiscal year 2020 spending request for the Department of Justice. However, top Democrats grilled the attorney general on his Mueller report summary.

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The subcommittee's chairman, Rep. José Serrano (D-NY), expressed his doubt on how Barr accurately turned a 300-page report in to a four-page summary in his prepared opening remarks.

Barr indicated that a redacted version of the Mueller report would be made available "within a week."

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Fox News' Chad Pergram and Gregg Re contributed to this report.