China warned Canada on Saturday of severe consequences if it does not immediately release the CFO of Chinese tech giant Huawei, calling the case “extremely nasty.”

A Canadian court has delayed a decision until Monday on whether to grant bail to Meng Wanzhou, who was arrested in the Vancouver airport a week ago at the request of the U.S.

Meng was nabbed at the same time President Trump was meeting with Chinese leader Xi Jinping in Argentina on trade.

The daughter of Huawei’s founder faces extradition to the US, which alleges she used a shell company to sell equipment in Iran in violation of US sanctions, and misled American banks about the company’s business in Iran. She faces up to 30 years in jail if found guilty.

China insists that she has not violated any laws and called the arrest “unreasonable,” saying it “ignored the law.”

China summoned the Canadian ambassador to meet with Vice Foreign Minister Le Yucheng in Beijing Saturday and lodged a “strong protest” over Meng’s arrest.