There's really nothing to worry about here from a geopolitical-tension-escalation perspective. Rocket Lab does make some technologically-impressive hardware, especially their carbon-fibre structures and metal-3D-printed engines. But their current rocket (Electron) has a maximum payload of only about 300Kg to low orbit, and their next rocket currently in development (Neutron, with a reusable first stage) with a 13 tonne payload capability to low orbit is several years minimum away from flying missions.

This is probably more of a way for the US senate to throw more cost-plus-contract slush money at Lockheed Martin - one of the owners of Rocket Lab.