James Chapman, a former aide to Brexit Secretary David Davis, has become an outspoken critic of Britain's looming departure from the 28-nation bloc.
He is calling for a new centrist political party because both the governing Conservatives and main opposition Labour parties say they will go through with the decision to leave.
Chapman said Friday 'there is an enormous gap in the center now of British politics' that could be filled by an anti-Brexit force.
Former Prime Minister Tony Blair has also called for pro-EU politicians from all parties to unite.
Britain is currently negotiating its divorce from the EU and is due to leave in March 2019.