Ireland’s accounting watchdog has written to the UK’s largest audit firms urging them to start preparing for a “no-deal” Brexit to minimise the disruption to their businesses that could arise from March 29 onwards.

Irish Auditing and Accounting Supervisory Authority sent the letters this week outlining measures that UK-based firms will need to take to continue operating in Ireland if Britain leaves the EU without a deal.

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US President Donald Trump has canceled his delegation’s trip to the World Economic Forum in Davos, Switzerland, next week due to the partial U.S. government shutdown, according to sources close to him.