President Donald Trump will further pressure Chinese President Xi Jinping in talks next week to take tougher measures against North Korea, as the United States compiles information for possible new sanctions on Chinese banks working with Pyongyang.

Senior administration officials say Trump will try to convince Xi when they meet in Beijing to squeeze North Korea with steps such as limits on oil exports, coal imports and financial transactions.

It is the latest attempt by Trump to have China, North Korea’s only major ally, rein in Pyongyang’s nuclear weapons ambitions but it is far from clear if Xi, who has just consolidated his power at a Communist Party congress, will agree.

China says its leverage over Pyongyang is exaggerated, and points to its support in the U.N. Security Council for recent sanctions on North Korea as evidence that it is trying to curtail the isolated nation’s nuclear and missile tests.

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