Senate Republicans announced plans to vote next week on their latest bid to scuttle Obamacare even as a popular comedian who has become part of the U.S. health care debate denounced the bill and former President Barack Obama on Wednesday warned of "real human suffering."

President Donald Trump endorsed the legislation on Twitter. But Republicans and the White House were on the defensive after Jimmy Kimmel used his late-night TV show to blast the proposal and call Republican Sen. Bill Cassidy, one of its two sponsors, a liar.

"This guy, Bill Cassidy, just lied right to my face," Kimmel said on his show on Tuesday night, referring to the senator who since May had touted a "Jimmy Kimmel test" of standards any Obamacare replacement would need to possess.