Trump allies will step up their attacks on prosecutors investigating the former president next week, with the launch of an online documentary accusing them of political activism and electioneering.

'Chasing Trump' is due to be released on April 17, two days after a court in New York will have begun jury selection in the first of Trump's four criminal prosecutions.

Its producers say it will delve into backgrounds of the prosecutors overseeing each of the cases. 

And with the former president subject to a New York gag order preventing him from attacking witnesses, prosecutors, jurors and court staff, as well as their relatives, it is another example of how he is relying on MAGA world to dish dirt on his accusers.

'"Chasing Trump" is an important documentary that exposes the leftwing prosecutors weaponizing the government to target my father,' Donald Trump Jr. told DailyMail.com. 

'It's the first documentary to do a deep dive into the backgrounds of the prosecutors behind the four cases against him and is a must watch for anyone who cares about preserving the rule of law and protecting our constitutional rights.'

Next week the world will witness the unprecedented spectacle of a former U.S. president reporting to court for the start of a criminal trial.

Jury selection is due to begin next Monday in Trump's hush money case. He is accused of falsifying business records to hide payments to a porn star during the 2016 presidential campaign.