Washington (CNN) Former Attorney General Alberto Gonzales said Friday that President Donald Trump's latest public attacks on Jeff Sessions make the President appear "weak."

"What I worry about is that, you know, the President is head of the executive branch and he decides who serves in his Cabinet. To continue to criticize the attorney general, I think, makes the President appear weak," Gonzales, who served under President George W. Bush, told CNN's "New Day" on Friday morning.

"If there is, in fact, displeasure in his service, then he has an obligation from my perspective to make a change."

In an interview aired Thursday on Fox News, the President lashed out at Sessions, arguing that the attorney general "never took control" of the Justice Department. Sessions then responded to the criticism in a public statement, saying "While I am Attorney General, the actions of the Department of Justice will not be improperly influenced by political considerations."

Trump continued the public criticism on his Twitter account Friday morning, asking the Attorney General to "look into" the White House's political opponents.

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