A federal appeals panel on Thursday appeared skeptical of U.S. President Donald Trump's argument that a 1977 law historically used for sanctioning enemies or freezing their assets gave him the power to impose tariffs.

U.S. reciprocal tariffs have put an estimated 30,000 jobs at risk, South African authorities said Monday, four days before a 30% U.S. tariff on most imports from South Africa kicks in. South Africa was slapped with one of the highest tariff rates by its third-largest trading partner — after China and the EU — creating uncertainty for the future of some export industries and catapulting a scramble for new markets outside the U.

South Africa’s government is putting the final touches to an overarching package that aims to shield businesses against the fallout from punitive US trade tariffs and plans to present it to lawmakers later this week.

South Africa on Monday outlined support measures for local companies that will be hit by a 30% U.S. tariff this week, including exemptions from some competition rules and financial support facilities.