Colonel Bob Stewart, a former soldier in the British Army, insists we are already at war with extremists.
Colonel Stewart served in the army at the height of the Troubles in Northern Ireland and, speaking to Julia Hartley-Brewer in the wake of the bombings in Belgium, he told the programme we are at risk of a similar event in Britain.
He said: "We are constantly under threat of attacks such as this these days. It doesn't matter what we do, these people are hell-bent on trying to destroy our society, which is why, personally, I consider we are at war with them."
Two bombs exploded at Zaventem Airport early on Tuesday morning, while another was detonated at Maalbeek/Maelbeek metro station, killing more than 30 people and leaving more than 130 injured.