My grandfather z’l related to me that as a child he made a brocho upon seeing the German Kaiser (obviously in friendlier times to the Jews). I do not remember what brocho he told me he made.
Additionally at the KAJ shuls in Washington Heights and Monsey the “Hanosen Teshua” tephilla is said every shabbos specifically mentioning “Adonienu Hapresident Shel Artzos Habris Yorum Hudo”
Politics aside, we must be greatful that we live in a country that allows us to openly practice our religion.