Judge Andrew Napolitano warned President Donald Trump that his latest salvo against Attorney General Jeff Sessions is “perfect fodder for the cannon of Bob Mueller and Never Trumpers.”

Trump went after Sessions in a string of tweets on Monday, accusing him of jeopardizing Republican chances in November's midterm elections with a series of Justice Department investigations.

“Two long running, Obama era, investigations of two very popular Republican Congressmen were brought to a well publicized charge, just ahead of the Mid-Terms, by the Jeff Sessions Justice Department,” Trump tweeted. “Two easy wins now in doubt because there is not enough time. Good job Jeff.....”

The president apparently was referring to the current investigations into GOP Reps. Duncan Hunter of California and Chris Collins of New York for alleged misuse of campaign funds and alleged insider trader, respectively.

On "Fox & Friends" on Tuesday, Napolitano said Trump is the chief law enforcement officer in the land and he has a right to be frustrated at a "total breakdown in communication" with his attorney general.

Despite that, Napolitano said, there is evidence of "serious crimes" committed by Hunter and Collins, and Republican members of Congress should not be held to a different standard of justice.

"It is the duty of the Justice Department to prosecute crimes when they find them and to bring indictments when a grand jury has decided there is enough evidence there," Napolitano said.

He said the DOJ would have been "most unwise" to wait until after the midterms to issue these indictments.

“When the president says these things -- basically, 'I want to you use Justice Department to help the Republican Party' -- that is fodder for the cannon of Bob Mueller and Never Trumpers and all those who wish the president ill,” Napolitano said.

“It's his using [of] his own words out of his own mouth to help put him in a box of the use of government for political purposes.”

Watch more from Napolitano above.