Key Democratic allies in the US health care battle warned Sunday that a Senate bill required major changes if it was to earn their support and give President Barack Obama a crucial victory on his top domestic priority.
Meanwhile, former Democratic National Committee Chairman Howard Dean told Huffington Post's Sam Stein that Democrats could be in "big trouble" because of delays in crafting health care legislation.
A knife-edge ballot Saturday saw Democrats scrape the 60 votes needed for debate to begin November 30, but wavering senators Joe Lieberman and Ben Nelson sent a strong message that they would not back the bill as it stands.
Lieberman, an independent senator from Connecticut who usually votes in line with the Democrats and did so on Saturday, opposes the creation of a government insurance program to compete with private firms, the so-called "public option."
"We have a healthcare system that has real troubles, but we have an economic system that is in real crisis," said Lieberman, who fears the government program would be too expensive for the cash-strapped US economy.