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Child health experts warn that cuts to international aid budgets that fund vaccination programmes, combined with vaccine scepticism, are creating a "perfect storm".

But the rise of self-driving cars and ride-hailing services on US roads has also been met with some scepticism over their safety.

Some of new members are close allies of Kennedy and have histories of vaccine scepticism.

The idea was greeted with scepticism in Ukraine and across Europe.

Despite scepticism about Chinese firms from Washington, Mr Buckley says the US should be looking to work with Beijing on the advancement of renewable energy.