Rep. Jerrold Nadler (D-N.Y.) says President Trump's firing of FBI Director James Comey could be an impeachable offense.

“If the president fired Comey because he asked for loyalty and hadn’t gotten it, because he had asked him to ease off on the investigation of [Michael] Flynn — because in effect he was asking him to ease off the investigation of possible collusion by the Trump campaign with the Russians in subverting the election — that would be obstruction of justice which is an impeachable offense," Nadler told CNN’s “New Day.”

Reports last month said Trump asked Comey to let go of his investigation into Flynn, the former White House national security adviser, before he fired the FBI chief.

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Comey reportedly maintained a paper trail to document what he perceived as the president’s improper attempts to influence his agency’s investigation into Russian election interference.

Nadler said obstruction of justice is about intent, not success.

“An obstruction of justice does not have to be effective — it is an intent-based crime,” he said.

“And that would be a very serious thing to attribute to the president."

Nadler, a House Judiciary Committee member, called for a special commission in addition to the Justice Department's special counsel to investigate whether the Trump campaign colluded with the Russians to interfere in the 2016 presidential election.

There are both federal and congressional probes looking into Russia’s involvement in the election.