Washington has raised concerns about the trade implications of Ottawa’s online-streaming bill, prompting a legal expert to warn that Canada could face hundreds of millions of dollars of retaliatory tariffs if it becomes law. U.S. Trade Representative Katherine Tai expressed disquiet about the proposed legislation, known as Bill C-11, during talks earlier this month with…

OTTAWA—Internet experts have cast doubt on whether the body the federal government wants to regulate streaming services and video-sharing platforms such as YouTube and Netflix has the expertise to do so. They have also questioned whether the Canadian Radio-television and Telecommunications Commission should be given new regulatory powers, or even if it fully understands how…