Federal prosecutors have asked a judge to revoke bail for Lev Parnas, saying the associate of Rudy Giuliani’s has lied to authorities about his assets and income and should be detained while awaiting trial.

In a letter filed Wednesday evening in federal court in Manhattan, prosecutors said Mr. Parnas didn’t disclose to pretrial services or to investigators income including a $1 million transfer from a Russian bank account, weeks before his arrest in October, to an account held in the name of his wife, Svetlana Parnas.

Prosecutors said that in the past three years, Mr. Parnas had received more than $1.5 million from Ukrainian and Russian sources. They didn’t provide more details about who those sources were.

Joseph Bondy, one of Mr. Parnas’s attorneys, said they were reviewing the government’s letter, and would file a response with the court in the coming days. Earlier this month, Mr. Bondy had asked the court to relax the terms of Mr. Parnas’s pretrial release.

Mr. Parnas and another associate, Igor Fruman, were arrested in October on campaign finance charges. Both have pleaded not guilty.