Nigeria’s President Muhammadu Buhari is meeting his US counterpart, Barack Obama, to discuss the fight against Islamist militant group Boko Haram.
President Obama’s wife Michelle got involved in the online campaign, #BringBackOurGirls, after the group kidnapped some 200 girls last year.
The US sent surveillance flights over Nigeria to help locate them.
However, the US refuses to sell weapons to Nigeria because of concerns over its army’s human right record.
The two are also expected to discuss the recovery of money stolen by Nigerian officials, which is believed to have been deposited in US bank accounts.
Nigeria is Africa’s most populous nation, biggest economy and biggest oil producer.
Mr Buhari, a former military ruler, was invited to Washington shortly after winning election in May – the first time an opposition candidate had won a national election.