Who did Trump fire, breaking a tie on the Surface Transportation Board?

The correct answer is Robert E. Primus. Donald Trump fired Primus, who was a Democratic member of the Surface Transportation Board, which resulted in breaking a tie among the board's members. This action was significant because it allowed for potential shifts in policy decisions and regulatory approaches in the transportation sector, particularly affecting freight railroads and other transportation systems overseen by the board. The Surface Transportation Board is responsible for regulating various aspects of transportation, and a tie among its members can lead to gridlock or indecision on important matters. By removing Primus, Trump aimed to gain more control over the board's direction, which would correspond with his broader agenda during his presidency.