Buhari said his administration is working to address the herdsmen killings across Nigeria.
Trump stated this while hosting Nigerian President, Muhammadu Buhari at the White House on Monday, April 30.
"We have had very serious problems with Christians who are being murdered in Nigeria, we are going to be working on that problem very, very hard because we cannot allow that to happen," he said.
Speaking earlier, Buhari said his administration is working to address the farmers and herdsmen killings and to checkmate illegal cross-border activities.
The Nigerian leader also thanked the US government for approving the sale of military hardware to Nigeria as part of its support for the anti-Boko Haram war.
Last week, suspected herdsmen attacked a Catholic church in Benue state, killing two priests and 17 worshippers.
Pope Francis had also condemned the attack as he prayed for Christians while conducting a mass in Rome on Sunday, April 29.
Over 200 people have been killed in Benue alone since the resurgent herdsmen rampage began in January.