By David Madden

WASHINGTON, D.C. (CBS) — New reports indicate that US senator Robert Menendez (D-NJ) could be indicted on federal corruption charges as soon as tomorrow.

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CBS News and other organizations are quoting sources close to the investigation as saying an indictment against Menendez is imminent.

Menendez has been investigated for a couple of years now regarding his involvement with a close friend and financial backer, Salomon Melgen, a South Florida ophthalmologist.

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Both men have steadfastly denied any wrongdoing.  Menendez, just last month, when word of a possible indictment first leaked, said, “‘I have always conducted  myself appropriately and in accordance with the law.”

It was not immediately clear what charges Menendez could face, although the probe has reportedly involved an exchange of gifts and services to Menendez in return for helping Melgin with Medicaid reimibursements and a port contract in the Dominican Republic.

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A spokesman for the senator has declined comment.