run interference
US /rʌn ˌɪntərˈfɪrəns/
UK /rʌn ˌɪntərˈfɪrəns/

1.
to help someone by dealing with problems or obstacles for them, often by distracting or blocking others
:
•
I'll run interference for you while you prepare your presentation.
•
The manager asked his assistant to run interference with the difficult client.