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The US is at risk of losing its top-notch triple-A credit rating within a decade unless it takes radical action to curb soaring healthcare and social security spending, Moody’s warned on Thursday. The warning over the future of the triple-A rating - granted to US government debt since it was first assessed in 1917 - reflects growing concerns over the country’s ability to retain its financial and economic supremacy. It could also further pressure candidates from both the Republican and Democratic parties to sharpen their focus on healthcare and pensions in the run-up to November’s presidential elections. Most analysts expect future governments to deal with the costs of healthcare and social security and there is no reflection of any long-term concern about US financial health in the value of its debt.