Milo Djukanovic is likely to return as Montenegro's prime minister.
President Filip Vujanovic told reporters in Podgorica that he has asked Djukanovic, the president of the Democratic Party of Socialists (DPS), to form a new government.
Vujanovic said he would officially inform parliament about his decision later in the day.
The DPS and its allies secured a governing majority in October 14 parliamentary elections.
If endorsed by parliament, it will be Djukanovic's sixth time in office during the past 21 years.
It will also be his second comeback from self-imposed retirement.
Djukanovic has also served one presidential term, from 1998 to 2002.
Opponents blame Djukanovic for widespread corruption, and accuse him of running Montenegro with his family and cronies as if it were a private business.
Based on reporting by dpa and B92