Sen. Marco Rubio (R-Fla.) speaks in Washington on June 13. (Charles Dharapak/AP) Sen. Marco Rubio (R-Fla.) speaks in Washington on June 13. (Charles Dharapak/AP)

Sen. Marco Rubio (R-Fla.) sent a letter Monday to Health and Human Services Secretary Kathleen Sebelius questioning why the agency was spending at least $8.7 million to promote the Affordable Care Act through television ads.

Calling it a "blatant misuse of federal dollars to promote a fundamentally flawed law," Rubio suggested the Centers for Medicare & Medicaid Services should abandon its plan to launch an advertising blitz about the law as the open enrollment date of Oct. 1 draws near.