They contended that the decision could trigger humanitarian crises in Nothern states bordering Niger.
Talks are ongoing in Abuja by ECOWAS leaders to resolve the political impasse and release of Mr Bazoum in Niger.
The restraint the U.S. is exercising from declaring the overthrow a coup is only a means to an end, according to a report.
The flags have been in demand since President Mohamed Bazoum was toppled in a military takeover last month.
A former rebel leader and politician in Niger has launched a movement opposing the junta that took power in a July 26 coup.
Food distributions are underway in Diffa, which hosts internally displaced people, refugees, others.
It is also because of its uranium and oil reserves that it has economic and strategic importance for the United States, Europe, China, and Russia.
The United States government has threatened to withdraw multimillion dollars in economic and security support given to the Republic of Niger.
“If there is a desire on the part of the people who are responsible for this to return to constitutional order, we are prepared to help with that…”
In a press release, the chairman of the ECOWAS Authority of Heads of State, President Bola Tinubu, said the summit would be held in Abuja.
