Lebanon's president and prime minister signed decrees accepting the resignation of Foreign Minister Nassif Hitti on Monday and appointing Charbel Wehbe to replace him, the presidency said on its Twitter account.
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Wehbe is the diplomatic adviser of President Michel Aoun.
The decrees were later read out by the cabinet's secretary general in remarks broadcast by local media.
Hitti decided to quit over differences with the prime minister and frustration at being sidelined, a ministry official and sources close to him said earlier.