Whether we like it or not, Liberals are citizens too.
President Trump is giving them an audience. As you say, it's up to him whether to accept them or not.
We know liberals are citizens. Speaking to “audience” point, we can’t stop him from listening to liberal views. I decry their influencing him....or as DJT himself puts it: Ivanka is “always pushing me to do the right thing”.
I don’t like the aggressive “pushing”, and neither do most conservatives. Granted, there is little we can do about it except to express our annoyance.