It has never been more important to have a strong movement behind Medicare for All," wrote Sen. Bernie Sanders (I-VT) and Reps. Dennis Kucinich (D-OH) and John Conyers (D-MI) in a letter addressed to "friends of health care for all."

The trio, all of whom have sponsored single payer bills, argued that cost controls are insufficient in the health reform law enacted March and claimed the growing need to save money would galvanize support for such a system.