Not only should POTUS declare Dominion and accomplices as a national security threat, but should have the military secure all machines, peripherals, networks and networking gear including servers, as immediate dangerous enemy materiel and equipment and evidence of an attempted coup.
Any personnel knowingly operating said equipment with awareness of these capabilities is an enemy combatant and subject to the laws of warfare.
Anyone giving orders to carry out those capabilities are enemies of the state and should be held as prisoners of the military.