A proposal to deter states from regulating artificial intelligence for a decade was soundly defeated in the U.S. Senate on Tuesday, thwarting attempts to insert the measure into President Donald Trump’s big bill of tax breaks and spending cuts.

Senate Republicans hope they are hours away from passing their massive tax and immigration bill. But the outcome is far from certain.

The Senate is slogging through an overnight session as Republican leaders search for ways to secure support for President Donald Trump’s big bill of tax breaks and spending cuts