The event was cancelled in 2020 after the Scottish Events Campus (SEC) was transformed into the NHS Louisa Jordan.
Senior police chief says arrival of US President Joe Biden and Pope Francis would 'escalate the event significantly'.
Bosses confirmed the event will not take place over Christmas at Glasgow’s Scottish Events Campus.
Workers have been told they no longer have a job due to the furlough scheme coming to an end.
The First Minister confirmed the move on Monday after military figures had been seen at the centre last week.