LINCOLN, Neb. (AP) — A proposed gas-tax increase has won first-round approval from Nebraska lawmakers.

Senators voted 26-10 on Wednesday to advance the measure. Two more votes are required before it advances to Gov. Pete Ricketts, who opposes the increase.

The measure would phase in a 6-cent increase over four years, raising the total gas tax to 31.6 cents per gallon.

Sen. Jim Smith of Papillion says he introduced the bill to help pay for maintenance for the state’s aging bridges and roads. Opponents in the Legislature say the tax increase will disproportionately affect the poor because many spend a larger proportion of their incomes on gas.

If Ricketts vetoes the bill, supporters will need at least 30 senators for an override.