A jury found Donald Trump’s former campaign chairman, Paul Manafort, guilty on eight counts of bank and tax fraud related to his work as a political consultant overseas in the first trial win for Special Counsel Robert Mueller.

After four days of deliberation, jurors told Judge T.S. Ellis III that they could not reach an agreement on 10 other counts, leading him to declare a mistrial on those charges.

The jury’s decision came after a 12-day trial in the Eastern District of Virginia during which Justice Department prosecutors called 27 witnesses and admitted more than 300 documents into evidence alleging that Manafort engaged in a complex, multi-year scheme to hide millions of dollars in foreign bank accounts and fraudulently apply for bank loans.

It was the first case which Mueller’s team brought to trial. At the same time the verdict came down, Trump’s longtime personal lawyer, Michael Cohen, pleaded guilty in a federal courtroom in Manhattan to eight charges of campaign finance, bank fraud and tax evasion charges.

The jury in the Manafort trial found him guilty of five counts of tax fraud, two counts of bank fraud, and one count of hiding foreign bank accounts, according to the Associated Press. The jury could not reach a unanimous decision on 10 separate counts, including other charges of bank fraud, conspiracy to commit bank fraud and failure to report foreign bank accounts

“When you follow the trail of Mr. Manafort’s money,” prosecutor Greg Andres said during his closing argument on Aug. 15, “it is littered with lies.”

Manafort’s defense attorneys did not call any witnesses of their own and relied heavily on their cross examination of Rick Gates, Manafort’s former business partner and the prosecution’s star witness. Gates admitted during his testimony to committing multiple crimes and cheating on his wife. “Once you discredit Mr. Gates,” defense lawyer Kevin Downing said during his closing argument on Aug. 15, “then the government has had a major failing in here.”

Although this case did not directly relate to President Trump or Russian election interference, it was the first trial to result from Mueller’s investigation. As the President continues to call Mueller’s investigation “rigged” and a “witch hunt,” the conviction on eight counts helped demonstrate the effectiveness of Mueller’s detailed work and helped prove the legitimacy of the investigation to a skeptical public.

In comments to reporters en route to a rally in West Virginia on Tuesday night, Trump called the Manafort verdict “a very sad thing” and again called the investigation a “witch hunt.”

“It’s a very sad thing that happened. This has nothing to do with Russian collusion,” Trump said. “I feel very badly for Paul Manafort. Again, he worked for Bob Dole. He worked for Ronald Reagan. He worked for many people, and this is the way it ends up.”

“This is a witch hunt, and it’s a disgrace,” he added.

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Write to Tessa Berenson at tessa.berenson@time.com and Katie Reilly at Katie.Reilly@time.com.