Donald Trump's campaign manager will not be prosecuted on a misdemeanor battery charge after prosecutors determined there wasn't enough evidence to convict him of forcibly grabbing a female reporter.

FILE - In this Aug. 25, 2015, file photo, Republican presidential candidate Donald Trump, right, walks with his campaign manager Corey Lewandowski after speaking at a news conference in Dubuque, Iowa. (AP Photo/Charlie Neibergall, File)

Police charged Corey Lewandowski last month after determining a video recording showed the New York City resident grabbing reporter Michelle Fields by the arm as she tried to ask the Republican presidential front-runner a question as he was leaving a campaign event March 8.

"Although there was probable cause to make an arrest, the evidence cannot prove all legally required elements of the crime alleged and is insufficient to support a criminal prosecution," according to a court document filed Thursday by state attorney Dave Aronberg.

Fields, who worked for the conservative Breitbart News website at the time, tweeted a photograph of her bruised forearm and said she had been yanked backward.

Lewandowski had denied grabbing Fields and Trump had stood by him, rejecting calls by his opponents to fire him. Instead he went after Fields, accusing her of exaggerating and changing her story.

The investigation proved, however, that Lewandowski "pulled Ms. Fields back" as she attempted to interview Trump, according to a memo by another prosecutor, Chief Assistant State Attorney Adrienne Ellis. The memo says that Lewandowski could have believed Fields was "making unwanted physical contact with Mr. Trump" that led him to pull her away.

"Mr. Lewandowski may have had apparent authority to assist in the protection of the candidate, specifically to maintain the `protective bubble' around the candidate," Ellis wrote. "While the facts support the allegation that Mr. Lewandowski did grab Ms. Fields' arm against her will, Mr. Lewandowski has a reasonable hypothesis of innocence."

At a Wisconsin campaign rally hours after Lewandowski was charged, Trump read Fields' account aloud: "Maybe he touched (her) a little bit, but I didn't see," Trump told the crowd. "It was almost like he was trying to keep her off me, right?"

Fields weighed in on Twitter: "My story never changed. Seriously, just stop lying."

She quit Breitbart shortly after the altercation, saying its editors didn't support her as they tried to maintain their relationship with Trump. Other Breitbart employees also quit.

Aronberg said he had talked with Fields and she was disappointed he decided against pursuing the charge.

The prosecutor also said Lewandowski could have signaled to Secret Service agents if he thought Fields was a threat, and he could've apologized.

"In a case like this we do encourage an apology. Had an apology been given at the beginning of all this, we could have avoided the whole criminal justice process," Aronberg said.

The prosecutor's announcement came days before the New York primary next Tuesday. Trump hopes New York marks an end to the worst period of his candidacy, a stretch that raised new questions about his policy chops and revealed his campaign's lack of preparedness for a potential delegate fight if the GOP race heads to a contested convention.

The prosecutor said he understood the case had garnered international attention, but the political climate did not affect his decision.

(Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

 

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