"If the Nigerian Government continues to allow the killing of Christians, the USA. will immediately stop all aid and assistance to Nigeria, and may very well go into that now disgraced country, 'guns-a-blazing,' to completely wipe out the Islamic Terrorists who are committing these horrible atrocities," Trump posted on social media.
"I am hereby instructing our Department of War to prepare for possible action. If we attack, it will be fast, vicious, and sweet, just like the terrorist thugs attack our CHERISHED Christians!"
The warning of possible military action came after Nigeria's President Bola Ahmed Tinubu earlier on Saturday pushed back on Trump announcing a day earlier that he was designating the West African country "a country of particular concern" for allegedly failing to rein in the persecution of Christians.
In a social media statement on Saturday, Tinubu said that the characterisation of Nigeria as a religiously intolerant country does not reflect the national reality.
"Religious freedom and tolerance have been a core tenet of our collective identity and shall always remain so," Tinubu said. "Nigeria opposes religious persecution and does not encourage it. Nigeria is a country with constitutional guarantees to protect citizens of all faiths."
Trump on Friday said "Christianity is facing an existential threat in Nigeria" and "radical Islamists are responsible for this mass slaughter".
Trump's comment came weeks after US Senator Ted Cruz urged Congress to designate Africa's most populous country as a violator of religious freedom with claims of "Christian mass murder".
Although the Department of Defense referred Reuters to the White House for comment on Trump's threat, Defense Secretary Pete Hegseth released a social media post of his own.
"The Department of War is preparing for action," Hegseth wrote on X.
"Either the Nigerian Government protects Christians, or we will kill the Islamic Terrorists who are committing these horrible atrocities."
Nigeria's population of 220 million is split almost equally between Christians and Muslims.
The country has long faced insecurity from various fronts including the Boko Haram extremist group, which seeks to establish its radical interpretation of Islamic law and has also targeted Muslims it deems not Muslim enough.
Attacks in Nigeria have varying motives. There are religiously motivated ones targeting both Christians and Muslims, clashes between farmers and herders over dwindling resources, communal rivalries, secessionist groups and ethnic clashes.
While Christians are among those targeted, analysts say the majority of victims of armed groups are Muslims in Nigeria's Muslim-majority north, where most attacks occur.
Kimiebi Ebienfa, a spokesperson for the Ministry of Foreign Affairs, reiterated the commitment of Nigeria to protect citizens of all religions.
"The Federal Government of Nigeria will continue to defend all citizens, irrespective of race, creed, or religion," Ebienfa said in a statement on Saturday.
"Like America, Nigeria has no option but to celebrate the diversity that is our greatest strength."
