China is warning the U.S. against letting Taiwan President Tsai Ing-wen pass through the United States next month on her way to Latin America, Reuters reported Thursday.

"We hope the U.S. can abide by the 'one China' policy," Hua Chunying, a Chinese Foreign Ministry spokeswoman, said during a briefing in Beijing, "and not let her pass through their border, not give any false signals to Taiwan independence forces, and through concrete actions safeguard overall U.S. China relations and peace and stability in the Taiwan strait."

China has been suspicious of Tsai and said her intentions in stopping in the U.S. were clear.

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Taiwan media has speculated the president will look to meet with Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's transition team before the president-elect's inauguration next month.

Trump faced backlash after taking a call from Taiwan's leader after his election victory. In speaking with Tsai, Trump became the first president or president-elect since Jimmy Carter to have a conversation with Taiwan's leader.

Carter broke off diplomatic relations with Taiwan, which Beijing views as a breakaway province from mainland China, as part of the One China policy. The policy effectively dictates that countries either recognize diplomatically the People's Republic of China, on the mainland, or the Republic of China, on Taiwan, but not both.

U.S. presidents in both parties, from Ronald Reagan and George W. Bush to Bill Clinton and Barack Obama, had abided by the policy, though the U.S. continues to sell arms to Taiwan.

Trump was critical of China throughout his presidential campaign, arguing that trade deals with the nation have hurt American jobs and workers.