They say x, ask for where they heard about x. They say from y news organization, ask the source for y. If they say z, if z is actually an actual document or otherwise, ask them where in z does y claim x is true.
If z is just another news organization, keep going until they provide (or don't provide) an actual document. If they can't procure an actual document, send it yourself. If z is just another video cIip, ask them for the whole video. Provide them the entire video if they can't.
Do not try to antagonize. Just simply ask the questions as if you were trying to understand their point of view, to learn something we might not have heard.
I firmly believe there are those of us that are more capable of doing this than others of us. Case in point: my husband is excellent at asking the tough questions because he’s patient & more unemotional. I, on the other hand, just get frustrated at how stupid they are. I defer to him quite often, especially when it counts & someone’s opinion could be changed. Love that man!