The Justice Department sued to block Hewlett Packard Enterprise's $14 billion acquisition of rival Juniper Networks on Thursday, the first attempt to stop a merger by a new Trump administration that is expected to take a softer approach to mergers.

The US Department of Justice has sued to block Hewlett Packard Enterprise’s $14 billion deal to acquire networking gear maker Juniper Networks, arguing that it would stifle competition, according to a complaint filed on Thursday.

Add company response. Juniper Networks (NYSE:JNPR) fell 3.2% after the Dept. of Justice sued to block its planned $14 billion sale to Hewlett Packard Enterprise (HPE). Hewlett Packard dropped 3.4%. The regulator argues that the combination would harm competition in the enterprise wireless market,