Arnold Schwarzenegger, the Governor of California, has brought in laws to deter celebrities and businessmen travelling to Britain to sue American-based publications in what has become known as libel tourism.

The new measures, personally signed off by Mr Schwarzenegger this week, will make judgments won against US magazines and newspapers unenforceable in California.

The legislation mirrors similar bills passed into law by the states of New York and Illinois and was strongly supported by the California Newspaper Publishers' Association.

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