PHILADELPHIA — State Sen. Vincent Fumo and associates defrauded the Senate, a museum and nonprofit group of about $3.5 million, far more than the initial estimate, prosecutors said Monday in preparation for his trial next month.

Fumo defrauded the Senate of nearly $2 million, while he and others defrauded a museum and nonprofit group of $1.5 million more, federal prosecutors said. The total is far higher than $2 million estimate prosecutors used in the 2007 indictment against Fumo. The amount would prove relevant if the senator is convicted and ordered to pay restitution.

The 65-year-old Fumo, a millionaire banker and lawyer, is leaving the Senate after 30 years to focus on his corruption trial. Jury selection is set to start on Sept. 8, and the trial is expected to last three months or more.

The trial memorandum filed Monday by the U.S. attorney's office charges that Fumo spent "enormous" sums of public money on political campaigns, personal expenses and friends.

"In using Senate funds and the large staff he was provided, Fumo observed no distinction whatsoever between public and private tasks," Assistant U.S. Attorney John Pease wrote.

Fumo also rewarded friends and staff for their "blind loyalty" with excessive Senate salaries, prosecutors said.

The memo charges that:

• Fumo gave several friends "ghost" jobs on the Senate payroll, including a five-year, $30,000-a-year job for Mitchell Rubin, now the state turnpike commissioner, "in return for no work at all";

• Fumo awarded political strategist Howard Cain an $80,000-a-year Senate contract although he did little state work;

• Fumo's future son-in-law, Christian Marrone, spent much of his first 18 months on the Senate staff overseeing renovations at Fumo's 33-room mansion near the Philadelphia Museum of Art.

Rubin is now married to Fumo co-defendant Ruth Arnao, who ran the South Philadelphia nonprofit, the Citizens Alliance for Better Neighborhoods.

According to the trial memo, Fumo obtained $17 million from Peco Energy for Citizens Alliance to settle claims he had brought against the utility in both his Senate and individual capacity.