Lebanon’s Foreign Ministry has declared Iran’s ambassador to Beirut persona non grata, ordering him to leave the country by the end of the week. The decision Tuesday was the clearest sign yet of deteriorating relations between the two countries and raises tensions within Lebanon over the role of Tehran and its Lebanon-based ally, the militant Hezbollah group. The decision is the latest step taken by Lebanon’s government against Iran after the most recent Israel-Hezbollah war broke out on March 2. Israel’s military has killed several members of Iran’s Revolutionary Guard in strikes around the long-suffering country.