This is not true. A small group of senators favor dialogue and only the use of force if all else fails. This group is the Northern Senators Forum. They don't want a military intervention yet because 1) They fear their areas will be affected by the flood of potential refugees and 2) They are related to Nigeriens (they speak Hausa and have similar culture, in fact they are the same people). Majority of the Senators favor intervention.
Nigeria has had enough! It can't allow a Wagner belt in the Sahel, it's completely against its interests. Europeans, whether western or Russian, should not be allowed to control Africa. The Chinese are respectful, they do business and leave. Africa should not let foreign forces start dictating economic policy like they do in Central African Republic. Today the Sahel, tomorrow the coastal West African countries. There's a reason why all the coastal and Island West African countries are intervening.