Senators in the United States have voted to move forward with a stopgap funding package aimed at ending the longest government shutdown in the country’s history.

In a procedural vote on Sunday, some eight Democrats broke rank and voted in favour of advancing a Republican measure that will keep the government reopen into January 30.

The measure would also fund some parts of the government, including food aid and the legislative branch, for the next year.

But there was no guarantee of an extension of healthcare subsidies under the Affordable Care Act (ACA). Instead, the deal struck between the centrist Democrats and the Republicans promises a vote on the issue by December.

The subsidies have been a Democratic priority during the funding battle.

Al Jazeera’s Mike Hanna, reporting from Washington, DC, said the procedural vote passed with 60 in favour and 40 against.

“Now, this is what is called a cloture vote – a procedure by which the Senate agrees to continue the debate about the legislation and begin introducing and passing the bills aimed at ending the shutdown,” Hanna said.

“The important thing about the cloture vote is that once it is passed, at that 60 percent majority, every subsequent vote is by a simple majority. So it would appear to be plain sailing in the Senate to pass this bill and the continuing resolution to refund the government and ending the closure,” he added.

If the Senate eventually passes the amended bill, the package still must be approved by the House of Representatives and sent to President Donald Trump for his signature, a process that could take several days.