CAIRO — Lawmakers in Libya’s internationally recognized Parliament overwhelmingly rejected a proposed United Nations-backed unity cabinet on Monday, dealing a blow to diplomatic efforts to swiftly reconcile the country’s splintered factions.

The Parliament, which meets in the eastern city of Tobruk, rejected the 32-member cabinet out of concern that it was too large, and that its members had been chosen not for their competency but to satisfy various regional factions, according to Abu Bakr Buera, an influential lawmaker.

Diplomats have been urging Libyan officials for more than a year to bridge the divisions that emerged in the years following the 2011 revolt against Col. Muammar el-Qaddafi, and that have left the nation battered by violence and split between competing governments in the east and west of the country.

The foreign pressure has also reflected growing concern about the rise of the Islamic State, which has capitalized on a vacuum of authority to seize territory and carry out deadly attacks, including a series of recent assaults on oil facilities.