Halakhah zu Schemot 28:6

Rabbi Diskin further cites a statement of the Mekhilta to the effect that the conversion of an Amalekite has no efficacy and hence even subsequent to "conversion" the lad had the status of a non-Jew; cf., however, Rambam, Hilkhot Isurei Bi'ah 12:7 and Hilkhot Melakhim 6:4; Kesef Mishneh, Hilkhot Melakhim 6:4; and Ba'al ha-Turim, Exodus 28:6. See also R. Judah Gershuni, Mishpat ha-Melukhah (New York, 5710) p. 144. For other interpretations see R. Aryeh Pomeranchik, Emek Berakhah, and R. Eliezer Dvorets, addenda, p. 15.