The Georgia prosecutor who has been investigating charges of election interference against former president Donald Trump will begin presenting her case to a grand jury as soon as Monday — drawing a blistering counter-attack from the target of her lengthy probe.

Fulton County District Attorney Fani Willis on Saturday notified former Georgia Lt. Gov. Geoff Duncan that he will testify early next week, the Atlanta Journal-Constitution reported Saturday, in a case that could slap the former president with racketeering and other charges relating to his conduct following the 2020 presidential election.

An indictment in the case would be Trump’s fourth criminal case this year, in what Trump called “a campaign and fundraising CON JOB.”

“RACIST Fulton County (Atlanta) District Attorney ‘Phoney’ Fani Willis … weakly presides over one of the deadliest communities in the U.S.,” Trump vented Saturday on Truth Social.

“AS PRESIDENT, CHALLENGING ELECTION FRAUD – MY DUTY & RIGHT!” he proclaimed.

The case, which focuses on Trump’s attempts to challenge the 2020 election results in the Peach State, will hinge on his January 2021 demand for Georgia Secretary of State Brad Raffensperger to “find, uh, 11,780 votes” — enough to overturn his razor-thin Georgia loss.

Fulton County Sheriff Pat Labat said last week that Trump would have to follow “normal practices” — including a mug shot — if indicted.