But at home, his opponents are getting organized.
Among those lining up to do battle are Mr. Davutoglu and a former finance minister, Ali Babacan, both former members of Mr. Erdogan’s conservative Justice and Development Party, or A.K.P., who have set up new parties.
Emerging from five years in the cold after falling out with Mr. Erdogan and resigning as prime minister and leader of the party, Mr. Davutoglu is hoping to chip away at the president’s loyal support base and help bring down his onetime friend and ally.
Alongside them, the strongest players in the six-party alliance are the center-left Republican People’s Party and the nationalist Good Party, headed by Turkey’s leading female politician, Meral Aksener.
The largest pro-Kurdish party, the Democratic People’s Party, or H.D.P. — whose charismatic former leader, Selahattin Demirtas, is in prison — is not part of the alliance, nor are smaller left-wing parties.
But all of the parties share a mutual aim: to offer the electorate an alternative to Mr. Erdogan in 2023.
Despite their gaping political and ideological differences, the opposition is hoping to replicate its success in local elections in 2019 when it wrested the biggest cities, including Istanbul, from the ruling A.K.P.
“It is a good start for the opposition,” Mr. Demirtas said from prison in an interview with a Turkish reporter. “What is important is the development of a deliberative, pluralistic, courageous and pro-solidarity understanding of politics that will contribute to the development of a culture of democracy.”