You had the exact same reaction as me. The first scene was interminable and the same-old anti-Trump-tirade we've heard a million times before. Nothing new, bold or refreshing there. Just stale old anti-Trump crap.
Then the play thankfully takes off after that. And the remainder of the play gets to be quite entertaining (with the exception of the despicable "so-called joke" later in the play). Would still recommend the show. But a good 20 minute trip (and dropping the entire first scene) would be advised.