The Dems agree that Trump has the right to fire Yovanovitch, but they claim that he should not have fired her. They supported this position with a long, one sided, story of her wonderful successes. Since this is an impeachment hearing, sensible people can only conclude that the Dems argument is that they are impeaching Trump, not because he's done anything wrong, but instead because they disagree with his policies.
Libs should find themselves embarrassed by this mess, but we all know that the Liberal agenda is far more important than the truth.