A gas tax holiday is a temporary suspension of the federal gas tax, currently set at 18.4 cents per gallon on gasoline and 24.4 cents per gallon on diesel fuel. That does not include state taxes, which often are higher.
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The tax provides more than $23 billion per year in revenue for federal highway and public transit programs.
The president cannot suspend the federal tax on his own. Congress would have to approve the move.
Both the House and Senate are controlled by Republicans.