Beware the Machiavellian Mrs May

London

NEVER presume that those with whom you disagree are stupid - they may be smarter than you think. Theresa May, the British prime minister, is not stupid, but possibly Machiavellian. Last November, the UK High Court ruled that the Westminster parliament must be consulted before Mrs May's government can activate Article 50 of the Treaty of Lisbon and formally tell Brussels that Britain wants to withdraw from the European Union.

The June 23 referendum on leaving the EU was not binding. David Cameron, the former prime minister, failed to consider what would h…