The reason for the pardon, which the President squeezed into his tweet, is that D'Souza was "unfairly treated by our government".
Mr Trump said on Thursday D'Souza "was treated very unfairly".
Back in 2014, D'Souza plead guilty to using straw donors to make $20,000 in illegal campaign donations to a Republican candidate in a senate race. This was more or less the thesis of his 2012 documentary, 2016: Obama's America, which proved immensely popular with some conservative audiences.
D'Souza was also sentenced to an eight-hour day of community service every week of the five-year term, weekly counseling, and was ordered to pay a $30,000 fine along with a $100 special assessment.
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Trump also pardoned Lewis "Scooter" Libby, former vice president Dick Cheney's chief-of-staff who was convicted of obstruction of justice and perjury, and Kristian Saucier, a US Navy sailor convicted of taking photos inside a nuclear submarine without permission. "Now it's Dinesh D'Souza", she continued.
Though Trump said no one had asked him to pardon D'Souza, a source familiar with how things unfolded told CNN that Sen.
During his plea hearing, D'Souza admitted how he "knew that causing a campaign contribution to be made in the name of another was wrong and something the law forbids".
Dinesh D'souza has stirred controversy earlier for his comments about former US President Barack Obama.
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D'Souza did argue he was being persecuted rather than prosecuted.
In a book titled The End of Racism: Finding Values in an Age of Technoaffluence, D'Souza said slavery wasn't a racist institution and segregation "represented a compromise on the part of the Southern ruling elite seeking, in part, to protect blacks".
He has previously launched campaigns against both Obama and the then-presidential nominee Hillary Clinton.
Shah would not say whether Trump took this action based on any type of recommendation from the Department of Justice's pardon attorney, instead saying the president coordinated with the White House counsel.
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Preet Bharara, who brought charges against D'Souza when he was US Attorney for the Southern District of NY, asserted that there was no unfairness in the case.