A federal judge on Tuesday rejected a call by prosecutor to yank the $1 million release bond for Lev Parnas, an associate of President Donald Trump's personal lawyer Rudy Giuliani, saying alleged misstatements by Parnas to authorities about his financial assets were not necessarily intentional.

"I think the strict conditions that exist [for bail] are appropriate," Judge Paul Oetken said at a hearing in U.S. District Court in Manhattan, as he declined to jail Parnas pending trial on charges of violating federal campaign finance laws.

Parnas, who played a role in Giuliani's efforts in Ukraine that have sparked an impeachment crisis for Trump, currently is required as part of his bail to remain in his Florida home, and be electronically monitored. His release bond is secured by $200,000 in cash.

Prosecutors contend that the Ukraine-born Parnas, who is accused of funnelling foreign money to American candidates, misled authorities about his financial assets when he sought release on bail after his arrest in October.

They say his omissions and other factors, including Parnas' failure to disclose payments he was receiving from a law firm, make him a flight risk.

At Tuesday's hearing, prosecutors revealed that Parnas' previously nondisclosed assets included a $1 million transfer from a lawyer for Ukraine oligarch Dmytro Firtash, who faces criminal charges in the United States, a month before Parnas was arrested.

"We believe he was trying to set up a way to flee," said Assistant U.S. Attorney Rachel Donaleski of Parnas. "Mr. Parnas poses an extreme risk of flight."

"Even now the government isn't clear how much money he has," Donaleski said.

"We still have serious questions as to how Mr. Parnas is getting his money."

But Joseph Bondy, Parnas' lawyer, said that Parnas had won a visa lottery to immigrate to the United States from the Soviet Union, and is "a proud citizen of the United States of America and continues to be."

"He has five children who are still in the home and one who is in a law firm," Bondy said. "Not once has he ever tried to flee."

"If he was trying to go anywhere it would be to go to Washington, D.C., and speak to Congress," said Bondy.

Last month, Bondy said that Parnas was willing to testify before Congress as part of an ongoing impeachment proceeding against Trump.