Tensions are rising between the Federal Communications Commission and Republicans in Congress who want to curtail its regulatory power. On one front, Republicans want to keep the FCC from regulating the prices broadband providers charge customers. Separately, they are trying to set a financial cap on the FCC’s Lifeline program, which provides phone and broadband subsidies. It’s all playing out against the backdrop of a continued legal battle over the FCC’s net neutrality rules, which seek to treat all Internet traffic the same.