The Trump Organization wants planning permission to build two golf courses at Menie, part of which is designated a site of special scientific interest.
Trump's plans were dealt a severe blow in December when Aberdeenshire Council's infrastructure committee rejected the plans.
There will now be a public inquiry held in June, to determine whether Trump can push ahead with the plans. BIG has been charged with drumming up local support in the run-up to the inquiry. BIG director Zoe Corsi will head up the account and report into The Trump Organization MD George Sorial.
Sorial told PRWeek: 'We need support in ensuring we communicate our key messages about the economic impact and the environment.'
The Trump Organization recently parted company with lobbyists The Policy Partnership.