The companies submitted the deal in June to the Committee on Foreign Investment in the United States, or CFIUS, an executive branch panel that examines foreign investment for potential threats to national security.
Many deals are approved during an initial 30-day review, but some transactions are given a second 45-day examination.
“Smithfield and Shuanghui International remain committed to working cooperatively with CFIUS throughout the process,” Smithfield said in the statement confirming it had been notified of the panel’s plan for an extended review.
“The CFIUS process is confidential and Smithfield and Shuanghui International do not intend to comment further on that process while it is ongoing. Smithfield and Shuanghui International continue to expect the transaction to close in the second half of 2013,” the company added.