Rabbi Yissachar Dov Rokeach, Belzer Rebbe (1854-1925)

Zionism itself is founded on denial of G-d’s providence, reward and punishment and the coming of the redeemer. Nationalism is built only on the ruins of the holy Torah, belief in G-d, His prophets, and the Talmudic Sages. Therefore, even if the movement were led by G-d-fearing, righteous men with the best of intentions, it would be impossible for it not to destroy faith and Torah. (Kuntres 22 Cheshvan, p. 108)

But it could be that before the arrival of moshiach, the Satan’s efforts will succeed and the wicked will get a state in Eretz Yisroel. Therefore it is an obligation on every Jew who must leave his home to move to America or somewhere else, but not to Eretz Yisroel under the state of these wicked men, because their state would be a great danger to every Jew’s body and soul. (Om Ani Chomah v. 6 13 Adar I 5717)