Yet there is another force that could deter Trump from some of his most extreme instincts: the $50 trillion US stock market.

The new world of policy debate reflects Trump’s towering influence over a GOP that he has transformed, boosting ideas once considered quixotic or ill-advised in Washington.

FTSE 100 LIVE: Stocks up as UK retailers warn of job cuts due to national insurance rise after budget The FTSE 100 ( ^FTSE) ...