Oh please. Not if the guy is now trying to court favor in Beijing. And he doesn't need their permission, he just needs to take their temperature on it and explain the difficulties involved. Taiwan needs China more than Chna needs Taiwan. Except that China views the whole sovereign country thing as a mistake.
And, no I don't ask my neighbors who I can invite to my house. But my neighbors don't view my apartment as an historical mistake and want to take it over. Nor do they have hundreds of missiles pointed at my apartment, nor are they slowing buying my apartment piece-by-piece.