The framework for a U.S. federal data privacy law took clearer shape at a Senate committee on commerce, science and transportation hearing Wednesday.

Lobbyists representing Google, Facebook and other tech companies discussed state law pre-emption, violation penalties, notification requirements and special protections for children with members of the committee. Data breaches at Uber, Facebook and Equifax and the implementation of the European Union’s General Data Protection Regulation are turning American regulators on both sides of the aisle toward a federal privacy law.