(Reuters) — Donald Trump has so far been unable to obtain a bond that would allow him to appeal a $454 million judgment in a New York civil fraud case without posting the full amount himself, his lawyers said Monday.

Mr. Trump must either find the cash or post a bond to prevent the state's authorities from seizing his properties while he appeals Justice Arthur Engoron's Feb. 16 decision ordering him and co-defendants to pay $464 million in penalties and interest for misstating property values to dupe lenders and insurers.

In a court filing Monday, the Republican presidential candidate's lawyers urged a mid-level state appeals court to delay enforcement of the judgment, arguing the amount was excessive.

They said the defendants had so far approached 30 surety companies through four separate brokers to obtain a bond.

“Enforcing an impossible bond requirement as a condition of appeal would inflict manifest irreparable injury on Defendants,” Mr. Trump's lawyers wrote.

The lawyers asked that he instead be allowed to post a $100 million bond while he appeals the judgment. A bonding company would be on the hook for any payout if Mr. Trump loses his appeal and proves unable to pay.

Mr. Trump's lawyers included a statement by Gary Giulietti, an executive with insurance brokerage Lockton Cos. LLC, which Mr. Trump has hired to help get a bond.

Mr. Giulietti wrote that a bond for the full $464 million "is not possible under the circumstances presented," noting that many sureties would not issue bonds above $100 million and were willing to accept only cash or securities — not real estate — as collateral.

Mr. Trump denied wrongdoing in the case, which was brought by New York Attorney General Letitia James in New York state court in Manhattan.

Mr. Trump earlier this month posted a $91.6 million bond to cover an $83.3 million defamation verdict for the writer E. Jean Carroll while he appeals, in a case that arose from his branding her a liar after she accused him of raping her decades ago.