It was an interview with Jonathan Swan about COVID-19 where Trump had a bunch of papers with graphs trying to show that the US was doing well with cases. The paper he handed over showed the rates of deaths per case (though Trump didn't seem to understand the graph), and Swan was asking him about the high rate of deaths in the US when looking at the total population of the country.
In case you missed the joke, this is a reference to how John Hinckley Jr shot Reagan because he thought it would impress Jodie Foster. It's posted today because of the assassination attempt on Trump yesterday.