The U.S. Justice Department has sued to block tech giant HPE from acquiring Juniper Networks, the networking firm, citing antitrust concerns.

The Justice Department on Thursday sued to block the tie-up, a $14 billion deal that would join the second- and third-largest companies providing wireless networking solutions for large corporate customers.

The DoJ says the merger would be anti-competitive while HPE says that's flawed logic and its ready "vigorously defend" itself in court.