At issue is a temporary spending legislation required to keep the government fully open after the October 1 start of the new budget year. The Republican-controlled House of Representatives sent the Senate a version of the bill with a provision that would defund the health care law, trying to seize the opportunity to dismantle one of Obama's signature domestic accomplishments.
The issue has roiled the Republican Party, exacerbating the divide between hard-right conservatives and more moderate party leaders who fear Republicans will get blamed if the government shuts down.
Encouraged by conservative groups, Texas Senator Ted Cruz spoke all night and into the morning in an attempt to delay passage of the spending bill. Cruz, a potential 2016 presidential candidate, had spoken for more than 19 hours by today morning, with occasional remarks by other conservative senators. But they were virtually sure to lose a procedural vote on the legislation planned for later today.
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Republicans fiercely oppose the health care overhaul, which requires Americans to buy health insurance. But Republican leaders opposed Cruz's time-consuming effort, arguing that defunding the health care law simply won't happen with a Democratic president and Democrats controlling the Senate.
Cruz, who had started speaking yesterday afternoon, filled the time in a largely empty chamber, criticising the law and comparing the fight to the battle against the Nazis. He talked about the Revolutionary War, the Washington ruling class, his Cuban-born father who worked as a cook and even recited Dr Seuss' "Green Eggs and Ham."
Democrats calculate that the public will blame Republicans for any interruption in government services or benefits, as it did during the last Republican-driven shutdown in 1995-96, which ended up reviving the political fortunes of President Bill Clinton.