Trump Campaign Manager Corey Lewandowski Will Not Be Prosecuted For Alleged Incident With Reporter: Source Following a run-in with a reporter, Corey Lewandowski won't face charges.

 -- Donald Trump's campaign manager, Corey Lewandowski, will not be prosecuted for simple battery following his altercation in March with former Breitbart reporter Michelle Fields, a source familiar with the investigation confirms to ABC News.

The state's attorney in Florida has decided not to move forward with criminal charges, says the source, adding the decision is expected to be formally announced Thursday.

Lewandowski was charged with the misdemeanor March 29 stemming from a March 8 incident at the Trump National Golf Club in Jupiter, Florida, police said.

“Lewandowski then grabbed Fields’ left arm with his right hand, causing her to turn and step back,” according to the police report, describing video of the incident. “Based on the above-described investigation, probable cause exists to charge Corey Lewandowski.”

At the time, the Trump campaign released a statement asserting Lewandowski’s innocence.

“Mr. Lewandowski is absolutely innocent of this charge," read the statement. "He will enter a plea of not guilty and looks forward to his day in court. He is completely confident that he will be exonerated.”

When Lewandowski was charged on March 29, he was released with a notice to appear in court on May 4.

The Trump campaign and Lewandowski's legal team did not immediately respond to requests for comment.

The state's attorney's office declined comment.