As I said on air, the R argument these witnesses don't have 1st hand knowledge is bizarre. The only reason we don't have the 1st hand knowledge witnesses is b/c Trump blocked them from testifying. That itself, as I argue in @nytimes today, is impeachable. https://t.co/n5GXGsiC0m

— Neal Katyal (@neal_katyal) November 13, 2019