CNBCTime Warner shares fall on reports that DOJ to make a major antitrust announcement involving AT&TCNBCReuters also reported, citing a source, that the Justice Department will sue AT&T to prevent it from buying Time Warner. Fred Imbert | @foimbert. Published 43 Mins Ago Updated 9 Mins Ago CNBC.com. SHARES ...Trump administration to sue to block AT&T-Time Warner dealPoliticoUS to Sue to Stop AT&T From Buying Time Warner: SourceU.S.