The U.S. Senate is due to vote Tuesday on whether to open debate on the latest Republican initiative to overhaul the health care system put in place under former President Barack Obama.

Senate Majority Leader Mitch McConnell is leading the push to move away from the Affordable Care Act, also commonly known as Obamacare, but over the course of the past month he has been forced to take a step back when it became clear there were not enough votes to pass two different versions of the bill.

Republicans hold a 52-48 majority in the Senate. With unified Democratic opposition to repealing the ACA, Republicans can only lose two dissenting votes, with Vice President Mike Pence casting the vote in the event of a 50-50 tie.

Republican Senator John McCain announced he would be returning to work Tuesday after a short absence during which he announced he was diagnosed with brain cancer.

What is not clear is which bill will be voted on. The House of Representatives passed its own repeal-and-replace legislation in May, a bill Trump applauded at a White House rally after its passage and then later described as "mean." He instead called for the Senate to approve legislation with more "heart."

Senator John Cornyn said Monday that Republicans will discuss the various health care bill options at a lunch Tuesday before the procedural vote.

Democratic Senator Al Franken called the lack of clarity about which bill would be considered "deeply troubling."

【美参议院将投票决定是否开始就取代奥巴马医保展开辩论】相关文章：

★ 百年夏普承认面临生存挑战

★ 乌坎民主梦幻灭突显基层民主局限

★ 中国商用飞机公司获得新订单

★ 美选战不断抨击中国 中国开始反击

★ 丑闻频出促使金融业加强监管

★ 孩子开销大怎么办？

★ 给你支招：让你躲过“电梯杀手”的17招

★ 东南亚高增长吸引投资者目光

★ 安倍晋三希望迅速取得成效赢回民众信任

★ 美国枪支管制的最大障碍是选民