Exclusive: Top CIA Official Under Investigation

According to government documents, Wilkes gave Cunningham $630,000 in cash and gifts in exchange for help in getting government contracts.

Wilkes was the founder of ADSC Inc, in 1995. Under Wilkes, the company obtained more than $95 million in government contracts.

Officials say they could not describe the CIA contracts in question because some of them were classified secret.

'Bribe Menu'

Cunningham is involved in what prosecutors call a corruption case with no parallel in the long history of the U.S. Congress. He actually priced the illegal services he provided.

Prices came in the form of a "bribe menu" that detailed how much it would cost contractors to essentially order multimillion-dollar government contracts, according to documents submitted by federal prosecutors for today's sentencing hearing.

"The length, breadth and depth of Cunningham's crimes," the sentencing memorandum states, "are unprecedented for a sitting member of Congress."

Prosecutors will ask federal Judge Larry Burns to impose the statutory maximum sentence of 10 years in prison.

The sentencing memorandum includes the California Republican's "bribery menu" on one of his congressional note cards, "starkly framed" under the seal of the United States Congress.

The card shows an escalating scale for bribes, starting at $140,000 and a luxury yacht for a $16 million Defense Department contract. Each additional $1 million in contract value required a $50,000 bribe.

The rate dropped to $25,000 per additional million once the contract went above $20 million.

At one point Cunningham was living on a yacht named after him, "The Dukester," docked near Capitol Hill, courtesy of a defense company president.

ABC News' Vic Walter contributed to this report.