Story highlights He was responding to a report that said Trump asked McGahn to stop Sessions from recusing himself

He said McGahn is unqualified to be in his role at the White House

Washington (CNN) A former director of the US Office of Government Ethics on Friday called White House counsel Don McGahn "a cancer who has done much to undermine anticorruption mechanisms in this country" following an explosive report published in The New York Times.

"He drove the federal election commission into a ditch to undermine our election laws. He did a direct assault on the ethics program and now we're learning he attacked the Department of Justice," Walter Shaub told CNN's Alisyn Camerota.

Shaub, a frequent critic of President Donald Trump who served as ethics director under the Obama administration and is now a CNN contributor, was responding to a report in the Times that said Trump ordered McGahn last March to stop Attorney General Jeff Sessions from recusing himself from oversight of the investigation into Russian interference in the 2016 election.

Trump's reported attempt to have a political ally maintain control of an investigation into his associates would add to a list of possible examples of Trump seeking to influence the Justice Department -- and opening himself up to potential obstruction of justice claims.

Ty Cobb, a lawyer for the President, told CNN Thursday night he "respectfully declines to respond." A message left with McGahn seeking comment Friday morning was not immediately returned.

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