The Prime Minister hit out at "pessimistic" numbers from the OECD after it said the UK was set for "sluggish" growth over the next two years.
Chancellor Jeremy Hunt also pushed back against the Paris-based body, insisting Britain is now "winning the war" thanks to tumbling inflation.
The backlash came as the Organisation for Economic Co-operation and Development downgraded its UK growth projections for 2024 and 2025.
It said the UK would witness the weakest growth across the G7 group of major economies next year.
The OECD-made up of 38 nations - predicts Britain will grow 0.4% in 2024, just ahead of last-placed Germany in the G7 group of wealthy nations. In 2025, it projects that the UK will grow by 1% - the weakest performance in the G7.
By comparison, the US is predicted to power ahead this year with 2.6% growth, followed by Canada at 1%, and Italy and France at 0.7%.
Growth In 2025, the US and Canada are expected to continue to enjoy strong growth rates of 1.8%, followed by France on 1.3%.
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