The Senate is set to consider an electric-car bill on Thursday, but Democrats are pressing for a public hearing before they move to debate the measure.
The legislation, the Electric Vehicle and Infrastructure Tax Credit, would help automakers offset federal and state taxes on the cost of buying electric vehicles.
Democrats are seeking to get a public accounting of the impact of the credit, which would include how many people would pay the full amount if they purchased a Tesla Model S or Model X. The bill is expected to pass the Senate on Thursday.
The Senate Finance Committee is scheduled to vote on the bill Wednesday, which is expected.
The House Finance Committee will vote on it Thursday, which should allow for debate before the bill can go to President Trump.