Trump federal antitrust enforcers have come out of the gate hot. Within the first month of Trump’s second administration, the DOJ has sued to block Hewlett Packard Enterprise’s (HPE) $14 billion acquisition of Juniper Networks (Juniper), a transaction that was unconditionally cleared in the UK and European Union on seemingly similar facts. The DOJ and FTC have also confirmed that the joint Merger Guidelines adopted in December 2023 under former Chair Lina Khan will remain in place.