A constitutional challenge has brought against the Canadian government over its Foreign Account Tax Compliance Act (FATCA) agreement with the US on August 11, 2014. It alleges that the Canadian government has crossed its power of constitution. The FATCA agreement between Canada and US provides tax related information and was signed on February 5, 2014. The challenge complains that the treaty violates the Canadian Charter of Rights and Freedoms and it supports their financial information to be detained without a warrant.