(CNN) - Mitt Romney is "pretending" the health care plan he instituted in Massachusetts is different than the national plan, President Barack Obama said.
In an interview with Public Radio International that aired Thursday, Obama pointed to the similarities between the two plans, without mentioning the Republican frontrunner by name.
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"We designed a program that actually previously had support of Republicans, including the person who may end up being the Republican standard bearer and is now pretending like he came up with something different," the president said.
The Massachusetts plan served as a model for the Affordable Care Act, signed two years ago Friday. Romney, the state's former governor, has since said the legislation was the correct course for his state but not meant as a model for a national overhaul. But the plan has proved a focal point of criticism aimed at the GOP frontrunner.
In Thursday's interview, Obama said Republican opposition to the plan, including the Supreme Court challenge, is politically motivated.
He said state governors will have a difficult time explaining resistance to the law to their constituents.
"When people see that in fact it works, it makes sense – as it's, by the way, working in Massachusetts – then I think a whole bunch of folks will say 'Why aren't we trying it as well?'" Obama said.
The Supreme Court is expected to hear oral arguments next week over the individual mandate provision in the law. In their opposition to the legislation, some Republican governors have refused to implement the terms until the Supreme Court rules.
Responding to the president's comments, Romney spokesperson Andrea Saul reaffirmed her candidate's plan to repeal "Obamacare ... on day one."
"Mitt Romney has always believed each state should be able to fashion their own health care reforms and, as president, he would replace Obamacare with free-market reforms that promote competition and lower health care costs," Saul said in an email.