Rep. Elijah Cummings (D-Md.) ranks his time on the House Select Committee on Benghazi among the lowest points of his career.

“This has been one of the saddest exercises I’ve ever engaged in in my 20 years in Congress,” he said Tuesday on MSNBC.

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“It’s been very partisan,” added Cummings, the panel’s ranking Democrat. "We’ve been locked out of so many things.

“Witnesses interviewed and we’re not told about it. Exculpatory evidence found out by the Republicans [and] they don’t tell us about it. A failure to allow us to have free access in regard to transcripts.”

Cummings accused Benghazi Chairman Trey GowdyHarold (Trey) Watson GowdySunday shows preview: 2020 Democrats jockey for top spot ahead of Nevada caucuses Sunday shows preview: Lawmakers prepare for week two of impeachment trial Green says House shouldn't hold impeachment articles indefinitely MORE (R-S.C.) of trying to prevent accountability for the panel’s GOP lawmakers.

“He is still not releasing certain transcripts,” he said. "I don’t think he wants the American people to see every syllable that has been talked about with regard to this issue.

“And I don’t think they want to be fact-checked,” Cummings added of Republicans. "That’s why they didn’t want us to have the report, because they knew we would fact-check it.

"They basically hid the report from us. It’s supposed to be a bipartisan effort. We literally got the report about three hours ago.”

Cummings added the panel’s report Tuesday does not alter the public’s understanding of the 2012 attack in Benghazi, Libya.

“All I want to say is that there’s been a lot of granularity that has been added, but the facts remain the same. There was no stand-down order. There was no effort to politicize the right’s talking points. And there’s no evidence of gun trading.”

The Benghazi panel on Tuesday released an 800-page report filled with new criticism of former secretary of State Hillary ClintonHillary Diane Rodham ClintonSchiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again.' The problem with Trump's Middle East peace plan Trump's Intel moves spark Democratic fury MORE.

It concludes that Clinton and other officials did not adequately heed concerns about growing extremism in Libya.

The summary also accuses Clinton, now the presumptive Democratic presidential nominee, of falsely blaming the violence on an anti-Muslim video behind unrest elsewhere.

Cummings and other panel Democrats on Monday released their rebuttal to the GOP’s report in an attempt to debunk its findings.

“We are issuing our own report today because, after spending more than two years and $7 million in taxpayer funds in one of the longest and most partisan congressional investigations in history, it is long past time for the select committee to conclude its work,” they said.