Former Trump campaign chairman Paul Manafort pleaded not guilty Thursday afternoon to mortgage fraud and other criminal charges filed by New York state authorities, as his lawyer vowed to challenge the case on grounds of double jeopardy.

Manafort, dressed in a blue jailhouse jumpsuit and a brown belt, was helped to his feet by his lawyers as he was arraigned before a packed courtroom in Manhattan Criminal Court on the charges, which accuse him of fraudulently obtaining millions of dollars worth of residential mortgage loans.

Judge Maxwell Wiley ordered him kept in the nearby federal jail in lower Manhattan, where Manafort has been kept last week.

"Traitor!" a man shouted at Manafort has he was led in handcuffs to his arraignment.

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The 70-year-old Manafort already is serving a federal prison sentence of seven-and-a-half years.

The New York state charges were announced minutes after he was sentenced for the second of two federal cases in March.

A 16-count indictment accuses him with three counts of residential mortgage fraud, a single count of attempted residential mortgage fraud, three counts of conspiracy, eight counts of falsifying business records, and one count of a scheme to defraud.

"No one is beyond the law in New York," Manhattan District Attorney Cyrus Vance Jr. Vance said in a statement issued in March.

Manafort's alleged actions "strike at the heart of New York's sovereign interests, including the integrity of our residential mortgage market," Vance added.

Vance was in the courtroom for Manafort's arraignment, but did not speak.

Manafort is next scheduled to appear in court for the case on October 9.

After Manafort said "not guilty" to the charges, his lawyer and prosecutors discussed whether he could waive appearing in court for future hearings before any trial.

The judge said he would advise Manafort that there are some proceedings he thinks Manafort should attend.

The case is related to loans that Manafort received or applied for from late December 2017 through the beginning of 2017, and were for real estate in Manhattan, Brooklyn and Long Island.

Manafort's lawyer told Reuters that he plans to challenge the charges by arguing that Vance is barred by double jeopardy from prosecuting Manafort since the charges relate to mortgage applications that were also a subject of Manafort's federal trial last year.

Last week, the U.S. Supreme Court refused to change a rule that says putting a person on trial for the same crime in federal and state courts does not violate the constitutional protection against double jeopardy. That ruling could harm Manafort's challenge to his New York state case.

Manafort was brought in handcuffs to the Criminal Court building in lower Manhattan earlier Thursday.

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Manafort, who had been doing his federal sentence in a prison in Pennsylvania, will be kept in federal custody as his New York case heads toward trial.

He originally had been expected to be held in the notorious Rikers Island jail in New York.