President Polk declared that reduction of the "Black Tariff" would be the first of the "four great measures" that would define his administration. He directed Walker to work out the details. In 1846, Polk delivered Walker's tariff proposal to Congress. Walker urged its adoption to increase commerce between the US and Britain. He also predicted that a reduction in tariff rates would stimulate trade, including imports. The result, asserted Walker, would be a net increase in customs revenue, despite the reduced rates.