Members of the March 14 coalition left when the speaker, Nabih Berri, called the vote after three days of often angry debate, The Daily Star reported. The government got support from 68 members of the 128-member chamber.
One of the major issues is the Special Tribunal for Lebanon, a court set up with support from the United Nations to deal with the assassination of former Prime Minister Rafik Harari. Mikati replaced Harari's son, Saad, as prime minister.
While Mikati said he supports the court, the March 14 coalition accused him of rejecting it. The coalition also says Hezbollah, which was allegedly behind Harari's killing, put Mikati in power.