President Trump's former campaign manager Corey Lewandowski clashed with ABC News host George Stephanopoulos on Wednesday over whether Trump has the authority to fire special counsel Robert Mueller.

Lewandowski told Stephanopoulos on "Good Morning America" his assertion that, following the recusal of Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE, it is not the case that only Deputy Attorney General Rod Rosenstein has the authority to fire Mueller.

"If the president wants to fire Robert Mueller, then by all accounts he has the legal authority to do so," Lewandowski said. "He could have done that on day one, he could have done that today."

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"Actually, Corey, right now that's not true," Stephanopoulos replied. "Right now it's the acting attorney general, Rod Rosenstein, that has that authority."

"No, George, you're wrong," Lewandowski fired back. "The president has a legal authority to fire Robert Mueller if he wants to."

"Now, Robert Mueller reports to Rod Rosenstein," Lewandowski added. "But Rod Rosenstein could also be terminated. Look, the Constitution is very clear. The president is the chief executive of this country and has the ability to hire and fire executives who work for him, and that would be the case with either Rob Rosenstein if he chose to, and he's not doing that, or Robert Mueller."

Democrats have warned Trump and Republicans that firing Mueller, who is overseeing the investigation into Russian meddling in the presidential election, would be crossing a red line. Last month, the ranking Democrat on the Senate Intelligence Committee said that Trump's tweets about the investigation made her believe that he was considering firing the special counsel.

“I’m growing increasingly concerned that the president will attempt to fire not only Robert Mueller, the special counsel investigating possible obstruction of justice, but also Deputy Attorney General Rosenstein, who appointed Mueller," Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.) said in June.

“The message the president is sending through his tweets is that he believes the rule of law doesn’t apply to him and that anyone who thinks otherwise will be fired. That’s undemocratic on its face and a blatant violation of the president’s oath of office."