Rep. Adam Schiff Adam Bennett SchiffSchiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power Rubio on peaceful transfer of power: 'We will have a legitimate & fair election' MORE (D-Calif.) early Tuesday expressed concern over the role of House Intelligence Committee Chairman Devin Nunes (D-Calif.) in the investigation into the Russian meddling in the 2016 presidential race.

"It does concern me is that he is still insisting on signing off on the subpoenas in the Russia investigation," Schiff said on MSNBC's "Morning Joe."

"That authority by our rules can be delegated to Mr. Conaway with consultation with myself. That's what should have been done by now, it hasn't been done, so that does concern me," he added, referring to Rep. Mike Conaway (R-Texas).

When pressed on why that hasn't been done, Schiff said Nunes "simply refuses at this point."

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"It's still inexcusable that he's ultimately a check on what the Russia investigation can do," Schiff added.

Nunes stepped aside from the inquiry into Russia's role in election tampering in April in response to an ethics investigation about his handling of the probe.

Earlier this month, Schiff said Nunes was violating his recusal from the House Intelligence Committee's Russia investigation by issuing subpoenas related to the matter.

"The committee rules provide that the chair has to sign the subpoenas unless that authority is delegated to someone else," Rep. Adam Schiff (D-Calif.) told Andrea Mitchell during an interview on MSNBC.

"That authority should have been delegated to Mike Conaway in consultation with myself. That hasn't happened yet. I think that's a violation of the recusal by the chairman."