The Department of Justice (DoJ) is filing suit to block AT&T Inc. T's purchase of Time Warner Inc TWX. The Analyst UBS' John Hodulik. The Lawsuit If the DoJ succeeds in blocking the deal, it will be the first vertical merger blocked in decades, Hodulik said. The DoJ must prove that combining a content owner with AT&T's distribution would be anti-competitive in an age where traditional TV viewership within the 12-24 demographic has fallen more than 50 percent in approximately seven years, Hodulik said. The analyst the lawsuit to cast uncertainty on other M&A deals that have been announced or that are circulating in the press. He named the Discovery Communications Inc. DISCA and Scripps Networks Interactive, Inc. SNI merger; the Walt Disney Co DIS and Twenty-First Century Fox Inc FOXA merger; and the Comcast Corporation CMCSA and Twenty-First Century Fox Inc FOXA merger as deals that could be affected by the litigation. Read moreThere is a small chance to break out the falling channel. $T, AT&T Inc. / D Stochastics are oversold, so we can expect some upside. $TWX, Time Warner Inc. New / D