In the United States, many scientific research agencies are federally funded and therefore dependent on decisions made by the administration and Congress. This is the case for well-known agencies such as NASA, the National Oceanic and Atmospheric Administration (NOAA), one of the world's leading centers for research into climate, weather and marine resources, and the National Institutes of Health (NIH), which handles medical and biomedical research.

In addition to conducting research themselves, these agencies award thousands of grants every year to scientists at American universities. The entire system has been hit by Donald Trump's budget cuts. Many researchers have been laid off and a portion of federal funding has been frozen, even as some court rulings are forcing the administration to backtrack.

How is the Trump administration mounting its attack against scientific research in the US, and which areas are the most targeted? Le Monde gives you an overview of what's happening in our three-minute video.