The president also used the interview with ABC to criticize the media's unflattering coverage of his first days.
Legislative proposal by Senators Susan Collins of Maine and Bill Cassidy of Louisiana would let states choose to keep Obamacare or move to a replacement program, for which states would also receive some federal funding.
The American heartland has higher rates of illness, obesity, drug overdoses, mental illness, alcoholism and suicide than the rest of the country.
Republicans were sharply divided, with 25 percent of those polled wanting to keep it intact or fix problem parts. Some 32 percent would repeal it immediately, while 44 percent would wait to repeal it once an alternative plan is ready to go.
U.S. House Republicans won passage of a measure starting the process of dismantling Obamacare, despite concerns about not having a ready replacement.
Most Americans think repealing it without a replacement is a bad idea, polls show, but there are some who are steadfastly against it.
Trump said he wanted a substitute for President Barack Obama's healthcare law done "very quickly or simultaneously" to the vote to get rid of it.
Majority leader says health law will be replaced 'rapidly' but others see a two-year window before new legislation takes effect.
Obama also said Liberals like former Democratic presidential candidate Senator Bernie Sanders had contributed to the program's unpopularity.
Democrats demanded an ethics probe into Tom Price following a report that Price traded in healthcare company stock while pushing legislation in Congress that could affect those shares.
President-elect scolds Democrats, labels Senate Democratic leader Chuck Schumer 'head clown.'
Democratic leaders met with Obama on Capitol Hill to discuss how they can protect the law and accused Republicans of wanting rip apart the American healthcare system.
The New York senator opens Congress with fiery speech, challenging the incoming president to live up to his campaign promises.
Repealing the law but delaying its implementation will all but kill the healthcare markets.
The continued popularity of the Affordable Care Act suggests a need for accessible insurance despite Donald Trump's calls to repeal and replace it.
Persistently rising drug prices have imposed a heavy burden on consumers.
The GOP majority flexed its muscles as Congress wrapped up for the year, but the hard work begins when they return in January.