Born in Copenhagen in Denmark in 1904, Loewenstein studied at a business school in Switzerland and a rabbinical seminary in Amsterdam, Netherlands.

[2] After emigrating to Mandatory Palestine in 1934, he remained active in Agudat Yisrael.

However, he later claimed:[3] It ignored our sole right to Eretz Israel, which is based on the covenant of the Lord with Abraham, our father, and repeated promises in the Tanach.

It ignored the aliya of the Ramban and the students of the Vilna Gaon and the Ba'al Shem Tov, and the [rights of] Jews who lived in the 'Old Yishuv'.

Loewenstein rejected the idea of a constitution for Israel, stating:[4] If it contradicts the Torah of Israel, it is a revolt against the Almighty; if it is identical with the Torah, it is superfluous.