On Jan. 2, 2021, former President Donald Trump asked Georgia Secretary of State Brad Raffensperger to "find" the votes needed to win the state in the 2020 election.

The now-infamous phone call helped spark a criminal investigation launched the following month by Fulton County District Attorney Fani Willis looking into the efforts by Trump and his allies to overturn the results of the 2020 election.

For a timeline on how the probe has unfolded, click here.

-ABC News' Meredith Deliso and Olivia Rubin

Who are the key players in the criminal probe into former President Donald Trump's alleged election interference?

Some are local officials, including Georgia Secretary of State Brad Raffensperger, who certified the state's election results, and District Attorney Fani Willis, who is expected to bring the case before a grand jury as soon as Monday.

Others were working with Trump during or after the election, including his former lawyers Rudy Giuliani and John Eastman, both of whom appeared before a special grand jury.

And there were also 16 "fake electors" who allegedly participated in a scheme to overturn the state's election results were notified that they were considered targets in the criminal investigation, prosecutors in court documents last year.

-ABC News' Meredith Deliso

Many eyes are watching Fulton County District Attorney Fani Willis as her investigation into alleged efforts by former President Donald Trump and his allies to overturn his 2020 election loss in Georgia nears its end and a potential fourth indictment looms for Trump, who denies all wrongdoing.

A charging decision is imminent. Willis is expected to present her findings to a grand jury this week.

"I would hate to have Fani Willis after me," Judge Jerry Baxter told ABC News. "She is a superb trial lawyer and the real deal."

-ABC News' Alexandra Hutzler

The Fulton County district attorney who has been probing former President Donald Trump's alleged efforts to overturn the 2020 election results in Georgia is expected to begin presenting the case to a grand jury on Monday morning, sources familiar with the matter tell ABC News.

The presentation from the Fulton County District Attorney's office comes after a two-and-a-half-year probe into the matter.

A spokesperson for the DA declined to comment.

This grand jury that will hear the case is a typical grand jury that has been seated for weeks and has heard other cases unrelated to the Trump probe.

It is not immediately clear how long the presentation will take.

Trump has denied any wrongdoing.

-ABC News’ Olivia Rubin

The indictment describes how several of the co-defendants, including Kenneth Chesebro, Michael Roman and James Shafer, worked together from Dec. 11, 2020. through Dec. 25, 2020, in several states including Georgia and Arizona, to commit acts “in furtherance of the conspiracy.”

The alleged acts include Shafer reserving a room at the Georgia State Capitol in Fulton County, Georgia to gather "Trump presidential elector nominees," and Chesebro sending emails to Roman regarding Trump presidential elector nominees in other states.

The indictment also describes how the co-conspirators allegedly communicated with the Trump campaign about the Trump electors.

According to the indictment, Rowan instructed an individual associated with the Trump campaign to "distribute information related to the December 14, 2020 meetings of Trump presidential elector nominees in Georgia, Arizona, Michigan, Nevada, New Mexico, Pennsylvania and Wisconsin to other individuals associated with the campaign and co-conspirator 4."

On Dec. 13, 2020, Chesebro sent an email to Giuliani outlining the “multiple strategies for disrupting and delaying the joint session of congress on January 6, 2021,” the indictment says.