Sprint Nextel on Monday announced its opposition to of T-Mobile USA.

The transaction, which requires the approval of the Department of Justice and the Federal Communications Commission, and will likely spark a host of hearings in the U.S. Congress, would reverse nearly three decades of actions by the U.S. government and the courts that modernized and opened U.S. communications markets to competition, Sprint said in a statement.

The wireless industry has sparked unprecedented levels of competition, innovation, job creation and investment for the American economy, all of which could be undone by this transaction, the company claims.

AT&T and Verizon are already by far the largest wireless providers. If approved, the proposed acquisition would create a combined company that would be almost three times the size of Sprint in terms of wireless revenue and would entrench AT&T?s and Verizon?s duopoly control over the wireless market. The wireless industry moving forward would be dominated overwhelmingly by two vertically integrated companies with unprecedented control over the U.S. wireless post-paid market, as well as the availability and price of key inputs, such as backhaul and access needed by other wireless companies to compete.

"Sprint urges the United States government to block this anti-competitive acquisition," said Vonya McCann, senior vice president, Government Affairs. "This transaction will harm consumers and harm competition at a time when this country can least afford it. As the first national carrier to roll out 4G services and handsets and the carrier that brought simple unlimited pricing to the marketplace, Sprint stands ready to compete in a truly dynamic marketplace. So on behalf of our customers, our industry and our country, Sprint will fight this attempt by AT&T to undo the progress of the past 25 years and create a new Ma Bell duopoly."