On October 31, President Trump announced on Truth Social (full text) that he is designating Nigeria as a "Country of Particular Concern" under the International Religious Freedom Act. He said in part:
... When Christians, or any such group, is slaughtered like is happening in Nigeria (3,100 versus 4,476 Worldwide), something must be done.... We stand ready, willing and able to save our great Christian population around the World.
In a follow-up Truth Social post on November 1 (full text), President Trump said:
If the Nigerian Government continues to allow the killing of Christians, the U.S.A. will immediately stop all aid and assistance to Nigeria, and may very well go into that now disgraced country "guns-a-blazing"...
The Pillar has more details.