FTSE 100 Live: Stocks to fall; oil drops to $90 but Trump warns ‘powerful’ return to war

Welcome back to the City AM FTSE 100 liveblog. It’s Tuesday morning and the UK’s blue-chip index is set to drop into the red despite making gains on Monday. The markets took a boost yesterday after oil dropped back after reaching two-month highs of more than $100 per barrel last week when the Iran backed-Houthis took responsibility…