The Deep Space Advanced Radar Capability (DARC) programme – announced by the UK, US and Australia in 2023 – will detect and track objects orbiting Earth.
The Ministry of Defence (MOD) wants to refurbish an airfield at Cawdor Barracks so it can house the UK’s main contribution to the scheme.
It would keep Cawdor open beyond its original closure date of 2028, but the scheme has been opposed by local campaigners.
In a Facebook reel, Morgan said the project should be “halted”, adding: “The United States under Donald Trump is not the partner it once was.
“Talk of targeting civilians, undermining our allies and diminishing the sacrifice of our armed forces is not the conduct of a reliable ally.”
She said there was a “clear difference” between standing with partners and “giving a free pass to a US president who has threatened war crimes and shown contempt for our country”.
The UK should pause its involvement in the radar project “until we can be confident those partnerships reflect our values and our security interests”, she said.