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.

Blackburn presented her amendment to strike the provision a day after agreeing to compromise language with Senate Commerce Committee chair Ted Cruz that would have cut the ban to