'Staffer'

[duothea]

ITV using 'Labour Staffer'

https://www.itv.com/news/2025-09-15/starmer-aide-made-sexually-explicit-remarks-about-abbott-leaked-messages-show

As far as I know, this is rather an American thing.

I've heard it everywhere for a number of years (I'm in Ireland). Probably started in the States but in common use now.

DH works for an MP.
They are known as Staffers when they are in Westminster. Commonly used.

I was called a staffer when i worked for the Labour Party in the 90s.