(CNN) Paul Manafort pleaded not guilty Thursday in New York state's Supreme Court to state fraud charges brought by the Manhattan district attorney's office, the third criminal case he has faced in recent years and one that may trigger a battle on double jeopardy grounds.

The former chairman of President Donald Trump's 2016 campaign, Manafort is charged by state prosecutors with 16 felony counts, including residential mortgage fraud and falsifying business records.

He was one of the first people charged by the office of special counsel Robert Mueller, resulting in a conviction by a jury last summer in one case and Manafort's guilty plea in another case. He is currently serving a seven-and-a-half year prison sentence for federal tax fraud, bank fraud and foreign lobbying violations.

During his arraignment Thursday before Justice Maxwell Wiley, Manafort, who is serving time at the Metropolitan Correctional Center in Manhattan, appeared in the courtroom in navy prison garb and thick-soled white sneakers, his hair bushy and gray, his face weathered and his wrists bound by handcuffs.

As he was led into the courtroom, he walked with a slight limp, and once inside he required assistance from his attorney to rise from his seat.

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