Price's makes it even more unlikely that Republicans will be able to repeal and replace Obamacare, even though they control the White House and both chambers of Congress.

"We think this has a very good chance," Donald Trump said.

U.S. President Donald Trump attacked his own party's Senate leader, Mitch McConnell, for a second day on Thursday, complaining from the steps of his private New Jersey golf club about Republicans' failure to repeal and replace Obamacare.