NEW YORK – Telecommunications regulators and industry groups voiced opposition Monday to a government-built wireless network that the Trump administration is reportedly considering . The news website Axios reported Sunday that national security officials may want a government-built next-generation "5G" mobile network because of concerns about China and cybersecurity. A White House spokesman referred inquiries to the National Security Council, which did not immediately respond to questions. The telecom industry, which is powerful in Washington, is already working on 5G, which heralds better internet on smartphones as well as potential applications for self-driving cars and other new technology. The new standard is already being tested and could be widely available by 2020.