News of a backlog at the U.S. federal department comes less than a week after national security experts urged the Trump administration to reverse its decision that allows Nvidia to export H20 chips to China.

NVIDIA has been called in by Chinese regulators over claims that its H20 AI chip poses security risks, putting billions in potential sales at stake.

China has summoned Nvidia to address alleged H20 chip security flaws, raising fresh concerns about the AI giant’s China business.