WASHINGTON (AP) — The Transportation Department says it has approved $1.5 billion to fund 91 infrastructure projects.

The grants will fund road, rail and port projects across the United States. Transportation Secretary Elaine Chao announced the grants on Tuesday.

Chao said the grants were the product of bipartisan cooperation between congressional Republicans and Democrats. Infrastructure is seen as a potential area of agreement between the Trump administration and Democrats, who will take control of the House of Representatives in January.

Boosting infrastructure spending was one of President Donald Trump’s main campaign promises, but he’s made little headway with a plan to invest $1.5 trillion in public and private funds over a decade.