[Update: The state charges against Paul J. Manafort have been dismissed by a judge in New York.]

Paul J. Manafort, President Trump’s former campaign chairman, is now in the sights of the Manhattan district attorney, Cyrus R. Vance Jr., whose office is set to bring charges against him. A federal jury in Virginia already convicted Mr. Manafort in a financial fraud scheme that could send him to prison for decades, and he has pleaded guilty in Washington to other federal charges.

But Mr. Vance’s prosecutors, who are said to be preparing charges to try to ensure that Mr. Manafort faces prison even if he is pardoned by the president, will most likely face a pitched legal battle and a political firefight.

A federal jury in August convicted Mr. Manafort of using foreign accounts to hide millions of dollars from his political consulting work in Ukraine, tax fraud and of lying to banks to obtain millions of dollars in loans. State charges, which would be brought by Mr. Vance, would be based on some of those same loans, which were issued by Citizens Bank in Rhode Island and Federal Savings Bank in Chicago, according to people with knowledge of the matter.

Mr. Manafort’s lawyers are almost certain to challenge any state charges on grounds of double jeopardy, and Mr. Vance, a left-leaning district attorney in a blue state, could face the inevitable accusation that his prosecution of a member of Mr. Trump’s inner circle is politically motivated.