Just say no, to Mitt Romney.

(The Hill) — Rep. Paul Ryan (R-Wis.) on Wednesday criticized the Massachusetts healthcare program critics have named “RomneyCare.”

Ryan, the chairman of the House Budget Committee and a leading GOP voice on fiscal matters, said that while he has not studied in depth the effects of the program — instituted by then-Gov. Mitt Romney (R) — it is having an adverse impact on the Massachusetts healthcare system.

“It’s not that dissimilar to ‘ObamaCare.’ And you probably know I’m not a big fan of ObamaCare,” he told reporters at a breakfast organized by the conservative American Spectator and Americans for Tax Reform.

Ryan is the third major Republican to recently criticize the healthcare reforms passed by Romney, who is a likely Republican presidential candidate.