Former President Donald J. Trump’s appearance before the Libertarian Party on Saturday was without modern precedent: the presumptive nominee of one party addressing the convention of another.
Why was trump invited to speak there? Its unprecedented to let the presumptive nominee of another party speak at a convention, because it is a very bad and unpopular idea.
The article discusses all those who were against this, but doesn't mention how or why the party decided to invite him.