US President Donald Trump should file a shorter complaint against the New York Times, a judge says. Photo: AP PHOTO

A federal judge has thrown out US President Donald Trump's defamation lawsuit against the New York Times over its content, calling it a "decidedly improper and impermissible" effort to attack his adversaries.

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US District Judge Steven Merryday said Trump in his $US15 billion ($A23 billion) lawsuit violated a federal civil procedure rule by failing to offer a short and plain statement of why he should prevail over the NYT, four of its reporters and the publisher Penguin

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