The home secretary has questioned whether international migration rules and conventions designed more than a century ago are “fit for purpose” ahead of a major speech in the United States.

Suella Braverman suggested a shake-up of international rules could be needed to tackle the migrant crisis.

She warned a failure to address the problem will undermine the “democratic legitimacy” of political institutions.

Ms Braverman has previously stated her personal view that the UK should leave the European Convention on Human Rights signed in 1950, which she has blamed for hampering efforts to introduce tough policies, such the Home Office bid to send some asylum seekers to Rwanda.

Critics of her approach also questioned its compliance with the 1951 United Nations Refugee Convention.

Ahead of her trip, the home secretary said: “Illegal migration and the unprecedented mass movement of people across the globe is placing unsustainable pressures on America, the UK, and Europe.

“We must come together and ask whether the international conventions and legal frameworks designed 50-plus years ago are fit for purpose in an age of jet travel and smartphones.

“I’m going to Washington to discuss this crisis with our American counterparts.

“If we fail to meet these challenges, then our political institutions risk losing their democratic legitimacy.”

Ms Braverman will travel to Washington on Monday and deliver a keynote speech on Tuesday setting out her assessment of the global migration challenges.

She will present a blueprint for how other countries can combat the crisis and claim the UK has led the way in bringing forward innovative approaches to tackle the problem.

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Almost 24,000 people have been detected crossing the English Channel so far this year, despite Prime Minister Rishi Sunak’s promise to “stop the boats” – though the figure is down from 2022.

The Rwanda scheme has been bogged down in legal battles, while an attempt to house people waiting for claims to be assessed on a barge in Dorset is paused after Legionella was discovered on board.

Ms Braverman is expected to also use her trip to seek closer co-operation with US authorities on tackling illegal migration and people traffickers.