The Trump administration’s actions in recent days have cast unprecedented uncertainty upon the climate panel’s work.

The Trump administration told US government scientists working on a global climate report to stop their work, one of the scientists involved told CNN.

President Donald Trump has implemented a slew of actions and executive orders that stand to have wide-reaching impacts on climate policies.

The Trump administration has halted the participation of U.S. scientists in key U.N. climate change assessments, two sources familiar with the situation told Reuters, part of its broader withdrawal from climate change mitigation efforts and multilateral cooperation.

Delegates to a key UN-backed climate meeting this week will be forced to consider what their future work might look like without US government participation.

Representatives of nearly 200 countries gather Monday to continue fraught negotiations on the timing and content of the UN's next blockbuster assessment of global warming science.