He was less clear about whether he thought it was constitutional, claiming that he would force the courts to rule on the issue.

FORBES: Four Questions For Obama's 14th Amendment Courtiers

Ismail and Razak must have thought through the necessary constitutional procedures.

CNN: MEMOIRS OF LEE KWAN YEW

Now that Indonesia is a democracy, the constitutional guarantee of freedom of worship might be thought to trump all other arguments.

ECONOMIST: Religious freedom is put at risk by political expediency

Some of Mr Clinton's allies thought this subpoena could be challenged on constitutional grounds, arguing that the judicial branch (unlike Congress) lacks the authority to compel evidence from the executive.

ECONOMIST: Step by step the shadow of the Lewinsky affair closes in

For what it is worth, I thought that the main lesson from Australia concerned constitutional inertia, and the difficulty in getting a referendum passed when the prime minister of the day is urging a 'no' vote.

BBC: Still settling in...

An old but creaking system of consensus, the lingering loyalty of bosses and employees to an unaffordable social-welfare model, and a web of constitutional checks and balances designed to prevent even the most fleeting thought of another tyranny, have all made it extraordinarily hard to carry out reform in Germany.

ECONOMIST: Drowning in troubles | The

Botros was a rebel, though within limits: he thought the collapsing Ottoman empire could be saved as a constitutional monarchy, a state composed of many nations.

ECONOMIST: Family history: Mount Lebanon’s children | The

It is a clever thought, but may overstate the degree to which most Britons suffer from constitutional angst.

ECONOMIST: Why the queen has to be seen to be believed

Tory Lord Jopling said it was "a major constitutional change" and Labour's Lord Foulkes of Cumnock said it had "not be thought through" and questioned how extending the electoral register to include younger votes would be funded.

BBC: Votes for 16-year-olds 'not inevitable'