The Justice Department is preparing to indict Democratic Sen. Bob Menendez of New Jersey on political corruption charges, CNN reports:

The Justice Department is preparing to bring criminal corruption charges against New Jersey Sen. Robert Menendez, alleging he used his Senate office to push the business interests of a Democratic donor and friend in exchange for gifts.

People briefed on the case say Attorney General Eric Holder has signed off on prosecutors' request to proceed with charges, CNN has learned exclusively. An announcement could come within weeks. Prosecutors are under pressure in part because of the statute of limitation on some of the allegations.

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The government's case centers on Menendez's relationship with Salomon Melgen, a Florida ophthalmologist who the senator has called a friend and political supporter. Melgen and his family have been generous donors to the senator and various committees the senator is associated with.

Investigators have focused in part on plane trips Menendez took in 2010 to the Dominican Republic as a guest of Melgen. In 2013, after word of the federal investigation became public, Menendez paid back Melgen $58,000 for the 2010 plane trips calling his failure to properly disclose the flights an "oversight."

Menendez has denied any wrongdoing in his ties to Melgen. His spokeswoman did not immediately comment on CNN's report that the Department of Justice is preparing charges against him.