PARIS (Reuters) - France will not let Lebanon down, a source close to French president Emmanuel Macron told Reuters on Saturday, following the decision of its prime minister-designate to quit after trying for almost a month to line up a non-partisan cabinet. “Lebanon’s Adib stepping down amounts to a ‘collective betrayal’ by Lebanese political parties,” the source said. The source also said Macron would make a statement at a later stage. Mustapha Adib, former ambassador to Berlin, was picked on Aug. 31 to form a cabinet after Macron’s intervention secured a consensus on naming him in a country where power is shared out between Muslims and Christians.