The Senate on Tuesday voted to approve a bill that would allow consumers to purchase helmets that emit a deadly chemical called carbonyl cyanide, which has been linked to the death of two people in New Jersey.
The Senate approved the bill 56-32.
It is the second time in the past week that the Senate has voted on the issue.
The vote was seen as a setback for Democrats, who are trying to pass legislation that would curb the sale of toxic and potentially dangerous products.
The bill would prohibit the sale, distribution and possession of carbonyls that can cause cancer or other diseases.
Senators voted Tuesday to add an amendment that would ban the sale and distribution of carbonies that emit chemicals that can damage human health or cause birth defects.
It was not immediately clear if the Senate would vote on the bill.
The issue of deadly and toxic products has been at the forefront of the presidential campaign.
Democratic presidential nominee Hillary Clinton and Republican nominee Donald Trump have been sparring over whether to ban or restrict the sale or distribution of dangerous and toxic product.
The proposal, sponsored by Democratic Sen. Dick Durbin of Illinois, was approved with 51 votes.
Durbins Republican colleagues, Sens.
Bob Casey of Pennsylvania and Richard Burr of North Carolina, voted against the measure.
The Associated Press contributed to this report.