And as much HIS bully pulpit as any other method of communication. He doesn't have to share his lectern with anyone, he doesn't have to share his Twitter account with anyone.
Anyone can say whatever (progressive) thing they wish on Twitter. They don't get to monopolize his space. Even if the fatally flawed fairness Doctrine was still in place they still would not get equal time with the president as an individual citizen, that's absolutely retarded.
Was someone seeking to monopolize Trump's space on twitter? When you say 'monopolize" in the context in which you are employing it, what does that mean to you?