Felon who tried to blackmail David Letterman now working for pro-Trump filmmaker James O'Keefe

A former television producer who admitted to attempting to blackmail David Letterman is helping the Donald Trump campaign dig up possible wrongdoing by Democratic operatives.

Robert “Joe” Halderman, who served four months in jail after pleading guilty to second-degree felony charges of grand larceny, has turned up with James O'Keefe's Project Veritas organization, reported Think Progress.

It's not clear exactly what Halderman is doing with Project Veritas, but the website reported that a receptionist confirmed he worked there and provided his email address with the organization.

Related: Operative featured in recent Project Veritas project coordinated with Breitbart to bring down Rubio

Project Veritas, which has received $10,000 in funding from Trump's supposedly charitable foundation, has produced a series of videos that purportedly reveal liberal activist groups illegally coordinating with the Hillary Clinton campaign to disrupt Trump rallies.

O'Keefe, who operates Project Veritas and the affiliated Project Veritas Action Fund, was sentenced in 2010 to three years of probation, 100 hours of community service and a $1,500 fine as part of a plea agreement after admitting to a botched “sting” attempt at the office of then-Sen. Mary Landrieu.

The conservative filmmaker is known for selectively editing videos to suggest wrongdoing by Democrats and liberal activists.

O'Keefe paid a $100,000 settlement to former ACORN employees after his videos misleadingly suggested they had agreed to help him smuggle underage prostitutes into the U.S.