A number of United States Congressional members, including Senator Bernie Sanders and Representatives Sander M. Levin, John Conyers, Jim McDermott and the now-retired Henry Waxman, as well as John Lewis, Charles B. Rangel, Earl Blumenauer, Lloyd Doggett and then-congressman Pete Stark, have expressed concerns about access to medicine. By protecting intellectual property in the form of the TPP mandating patent extensions, access by patients to affordable medicine in the developing world could be hindered, particularly in Vietnam. Additionally, they worried that the TPP would not be flexible enough to accommodate existing non-discriminatory drug reimbursement programs and the diverse health systems of member countries. In February 2015, former U.S. Labor Secretary Robert Reich stated he opposed the TPP because it would delay cheaper generic versions of drugs and because of its provisions for international tribunals that can require corporations be paid "compensation for any lost profits found to result from a nation's regulations."