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Senator Steve Daines, a Republican from Montana, questions Anthony Foxx, U.S. transportation secretary, not pictured, during a Senate Transportation, Housing and Urban Development Subcommittee hearing in Washington, D.C., U.S., on Wednesday, April 22, 2015. The Obama administration's six-year, $478 billion transportation reauthorization proposal, the GROW America Act, is a 'Band-Aid approach' that fails to put forward a long-term solution for sustaining highway and mass transit programs and includes unrealistic funding levels, said Senator Susan Collins at the hearing. Photographer: Andrew Harrer/Bloomberg via Getty Images

Senator Steve Daines, a Republican from Montana, questions Anthony Foxx, U.S. transportation secretary, not pictured, during a Senate Transportation, Housing and Urban Development Subcommittee hearing in Washington, D.C., U.S., on Wednesday, April 22, 2015. The Obama administration's six-year, $478 billion transportation reauthorization proposal, the GROW America Act, is a 'Band-Aid approach' that fails to put forward a long-term solution for sustaining highway and mass transit programs and includes unrealistic funding levels, said Senator Susan Collins at the hearing. Photographer: Andrew Harrer/Bloomberg via Getty Images