Rep. Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (Md.), the top Democrat on the House Oversight Committee, blasted the panel's chairman for refusing to meet with a whistleblower who claims to have information about Michael Flynn's efforts to do away with Russian sanctions.

The unidentified whistleblower claimed Flynn, President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s former national security adviser, told a former business associate on Inauguration Day that sanctions against Russia would be “ripped up” early into Trump’s presidency.

Cummings said the whistleblower, whom he found “authentic, credible and reliable," was willing to meet with the committee's chairman to discuss evidence of his claims. The chairman, Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.), refused the offer.

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“It is astonishing to me that you, as the sitting Chairman of the Oversight Committee, are declining to meet with a whistleblower who has agreed to come forward—despite fear of retaliation—to speak directly with you about evidence relating to former National Security Advisor Michael Flynn and his plan to lift sanctions in order to work with Russia to build nuclear reactors in the Middle East,” Cummings said in a statement directed at Gowdy on Wednesday.

Cummings publicly urged the Oversight chief to investigate the matter earlier in the day, asking him to subpoena Flynn and his business associates in a letter first reported by The New York Times. Cummings detailed the whistleblower's claims in the letter.

Gowdy, who also sits on the House Intelligence Committee, pushed back on Cummings's request. The South Carolina lawmaker said this matter belongs as part of the ongoing Russia probe led by the House Intelligence Committee, not Oversight.

“I think [the House Intelligence Committee] is the right committee to do it. My committee is looking into the things that are in the jurisdiction of the oversight committee,” he told a scrum of reporters on Wednesday night, noting that his committee is not investigating Russian interference in the election.

Cummings took aim at his reasoning for not meeting with the anonymous whistleblower.

“Your letter seems to resort to desperate and baseless jurisdictional excuses to avoid conducting oversight in an apparent attempt to protect President Trump and his administration. I ask that you please reconsider your position,” he wrote.

Last week, Flynn pleaded guilty to lying to the FBI about the nature of his communications with Russia's ambassador to the U.S.

Flynn, who had a short-lived service in the White House, has been a key person of interest in special counsel Robert Mueller's probe, as well as the multiple congressional probes looking into whether the Trump campaign colluded with Russia.