US inflation held firm last month as Donald Trump faces mounting pressure over the cost of living for millions of Americans.The closely watched consumer price index rose 2.7% in the year to December, in line with the previous month, according to official data published on Tuesday morning, ahead of a speech by the US president on the economy.The latest reading was broadly in line with economists’ expectations last month, and significantly above the Federal Reserve’s target for 2% inflation. Food prices and h ...