In this Wednesday, February 1, 2017 photo, riot police take cover behind their shields during a clash with farm workers in Mexico City. Rural residents from across the country flooded major boulevards of the capital Tuesday, as they denounced a gasoline price hike that has raised the price of tractor fuel and called for the renegotiation of NAFTA to make it more favorable to small farmers. (Photo by Eduardo Verdugo/AP Photo)
