Trump's right to be angry. But he also has the POWER to END this charade now. He can direct the Attorney General to end the rogue Mueller probe, to finish it and be done.
He can direct the Attorney General to appoint a Special Prosecutor to investigate Hillary Clinton and her nonsense.
And if Sessions refuses, he can fire him and hire Giuliani, who will do it. If not Giuliani, then Scaramucci.