Federal prosecutors say Alaska Senator Ted Stevens is a "crafty politician" who knows how to take gifts unnoticed.
They were speaking at the opening of the trial of Mr Stevens, who is accused of lying on Senate financial disclosure forms about gifts from an oil firm.
Mr Stevens, the longest-serving Republican in the Senate and bidding for re-election in November, has insisted he is innocent.
It is unclear whether the senator will testify during the trial.
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Testifying would expose the senator, who has a reputation for a quick temper, to a series of probing questions from the prosecution, the Associated Press says.
Election battle
During opening arguments, prosecutor Brenda Morris said Mr Stevens was a "crafty politician" who had learned during his long service in the Senate to accept gifts without being noticed.
Mr Stevens is accused of failing to disclose $250,000 (Ј135,000) of work done on his house free of charge by employees of the Veco oil company that normally builds pipelines and processing equipment.
He had "thumbed his nose" at the public's right to know about the gifts, Ms Morris said, according to AP.
Mr Stevens has pleaded not guilty, saying he has "never knowingly submitted a false disclosure form required by law as a US senator".
Mr Stevens has continued to campaign since he was indicted in July.
His Senate seat is up for grabs in November's election and polls suggest he is facing a tough battle against his Democratic challenger, Mark Begich, if he is to secure an eighth term.
(BBC)
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