In order to destroy something, satan produces a false copy of it. The Mahdi (as) has come. But there are many false mahdis. "Look how many false mahdis there are” he says. But the appearance of false mahdis is a portent of the coming of Hazrat Mahdi (as). False mahdis will appear before Hazrat Mahdi (as).
They describe the Mahdi (as) as if he will never come. The Mahdi (as) they describe will never come. They are lulling the nation to sleep. That dajjal (antichrist) you talk about will never come. How can you have a 20 km-long dajjal? Not even a child would say that. The Mahdi (as) they describe is impossible. They say he will tear all the walls down with a single takbir (phrase that says ‘Allah is the Greatest’). They say the walls will collapse when he says the name of Allah. In their eyes Islamic Union and Turkish-Islamic Union are impossible.