During the run up to the Iraq War Trump was asked on a radio show if he supported the invasion and he replied, "Yeah, I guess so." That is a fact. The exchange can be found on the Internet. 

When Trump subsequently lied about always being opposed to the war, the media called him on his lie. Nonetheless Trump and his followers called the media's characterization a lie and clung to their opinions (and presented these opinions as fact) that Trump had always been against the war. 

So in this case, at least, who's residing in the glass house?