The leaders of the world’s two superpowers, President Donald Trump and Xi Jinping, are set to meet in April. China and others hope to use the long-awaited summit as leverage and are calling on the United States to cancel arms sales to Taiwan. Trump should stick to his guns and hold firm to U.S. commitments to the embattled island nation.

In a Feb. 4 phone call, Xi reportedly told Trump that “the Taiwan question is the most important issue in China-U.S. relations.” The Chinese leader warned, “The U.S. must handle arms sales to Taiwan with caution.” Xi menacingly called for Trump to be “prudent” and said that “China will never allow Taiwan to be separated,” according to Chinese state media readouts of the conversation.