WATCH: Rep. Elijah Cummings reveals he no longer trusts ‘the integrity of the FBI’

Rep. Elijah Cummings (D-MD) questioned the integrity of the FBI after investigators have leaked information apparently aimed at damaging Hillary Clinton's campaign while protecting Donald Trump.

The ranking member of the Committee on Oversight and Government Reform questioned the double standard, which he has blamed on political pressure Republican lawmakers have put on FBI Director James Comey.

"The American people basically want fairness, but it appears clear that there is a double standard," Cummings said Tuesday night on MSNBC's "All In With Chris Hayes."

He said Comey promised before the committee in July that he would not subject Clinton to a double standard during the election, but some within the agency appear to have politicized the investigation.

"I am worried about the integrity of the FBI," Cummings said.

Cummings questioned Comey's decision to release scant information about an investigation linked to Clinton while sitting on possible links between Trump's campaign and Russian efforts to influence the election.

"We don't get a mumbling word, and a number of us in Congress have asked for months about information with regard to Mr. Trump, his advisors and the Russian government (about) any type of coordination or cooperation going on between them, and we have got not a mumbling word -- not one syllable," Cummings said.