The debate within the Democratic presidential primary is still nowhere near as nasty as the attacks between candidates for the GOP nomination, but Hillary Clinton and Bernie Sanders are voicing increasingly strong criticisms of each other's health policies.

Days after Clinton called Sanders' plan to establish single-payer health care too risky and too expensive, Sanders said the party frontrunner is neglecting a crucial subject: Paid family leave. The Vermont senator says Clinton's frequent calls for paid family leave are not enough; she has to release a plan.

Sanders has signed onto a bill in Congress that would reimburse employees for a certain portion of the wages they lose from taking 12 weeks off work. The reimbursements would be funded by a 0.2 percent payroll tax on both employers and employees.