President Donald Trump has suffered a major setback in his attempts to replace his predecessor's Obamacare with a new health bill.
The planned legislation had due to be voted on by politicians in the House of Representatives.
But it was withdrawn by top Republicans due to a shortage of support, despite lobbying by the White House.
The bill was almost certain to be defeated had a vote taken place and it was abruptly pulled by speaker Paul Ryan.
He told reporters: "We came really close today but we came up short."
Also, nearly half of Americans say the new healthcare reform measure is "not an improvement" over Obamacare, according to a Reuters/Ipsos opinion poll.
During his presidential campaign, Mr Trump made repealing and replacing Obamacare one of his big priorities.
The measure has been a top Republican priority and was the party's first major legislative effort since it took control of both the White House and Congress in January.
The legislation would repeal much of former President Barack Obama's 2010 healthcare law, including its requirement that people buy policies