12/2/2011 10:00 PM 

In a letter to the Federal Trade Commission (FTC), three more Senators have communicated concerns about the proposed Express Scripts and Medco merger and have urged a "thorough and complete investigation, including examining any potential impact on consumers, patients, third party and federal payers."

Sens. Saxby Chambliss (R-GA), Johnny Isakson (R-GA) and Jerry Moran (R-KS) wrote, "We understand that a combined entiy has the potential to control 60% of mail order and 50% of the specialty market.  With that type of market concentration, it is important that your agency works to see that access to health care is not limited."