UNCONTROLLED migration is an existential threat to the West, the Home Secretary said yesterday.
Leaders seeking to overhaul the system fear being labelled racist or illiberal, added Suella Braverman.
Speaking in Washington DC, she urged a shake-up of the UN’s 1951 Refugee Convention.
Ms Braverman told a right-wing think tank: “Uncontrolled immigration, inadequate integration and a misguided dogma of multiculturalism have proven a toxic combination for Europe over the last few decades.
“People could be in the society but not of the society.
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"And in extreme cases, they could pursue lives aimed at undermining stability and threatening security.”
The senior minister also said millions of asylum seekers are incentivised to “try their luck” in a system that needs reform.
She added: “It is an existential challenge for the political and cultural institutions of the West.
“It is a basic rule that political systems which cannot control their borders will not maintain the consent of the people, and thus not long endure.
"You do not have to be clairvoyant to see how this might all unfold.”
In all, 24,000 migrants have arrived by small boat this year. Yet no one crossing from France is in imminent peril, she said.
Amnesty UK’s Sacha Deshmukh dismissed Ms Braverman’s speech as “a display of cynicism and xenophobia”.