Another cheap shot at postmodernism.  Nobody argues that empirical facts (e.g., the presence of 15 people in a meeting) don't exist or have no value.  But one may argue that statements about these facts (e.g., "this is a large meeting") can be subject to discussion.  The authors of the US Declaration wrote: "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."  The fact is, not everyone believes these truths.  Their diffusion among individuals and nations is a political matter.  To recognize this is not to undermine the truth, on the contrary.  Trump's lies about the size of the crowd at his inauguration or the number of people who voted illegally are just that, lies.  Postmodernists deserve much criticism for their excesses; but blaming them for Trump's lies is absurd.