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In exchange for the cash, the documents said, Mr. Jefferson communicated with “Nigerian Official A,” thought to be Mr. Abubakar, to secure an IGate business venture in Nigeria, and met with high-level Ghanaian officials to obtain approval for IGate in Ghana.

Mr. Abubakar has denied any wrongdoing and he is not mentioned by name in the indictment.

The House Committee of Standards of Official conduct on Thursday reauthorized a panel to investigate Mr. Jefferson.