President Donald Trump has welcomed the first African leader to visit the White House during his presidency, Nigeria's Muhammadu Buhari.Security and economic issues top the agenda for the one-on-one meeting and working lunch. They also plan a joint news conference.SEE PICTURES BELOWThe Nigerian president's visit on Monday follows an uncomfortable start to the Trump administration's approach to the world's second most populous continent.Trump caused anger in Nigeria last year after reports that he said Nigerians wouldn't want to return to their "huts" if allowed to visit the US.Nigeria was also among the African nations that summoned the US ambassador to explain Trump's comments comparing Africa to a filthy toilet.Buhari was among the first two African leaders Trump called after taking office, along with South Africa's president.Trump's smile is suspicious. Did any of Buhari's aide read that document he is signing? He might just be selling off Nigeria without knowing. Because he knows nothing. pic.twitter.com/IGvebTTAK9— Kelvin Odanz (@KelvinOdanz) April 30, 2018Trump in Oval with Nigeria’s Buhari said they’re discussing:pic.twitter.com/qdDasbMJW8— Jennifer Jacobs (@JenniferJJacobs) April 30, 2018BREAKING: Buhari Meets Trump, Insists Nigerian Herdsmen Don’t Carry AK-47. https://t.co/1QJlUpPHhD pic.twitter.com/xYKJi5R9iM— Channels Television (@channelstv) April 30, 2018* Sign up to News24's top Africa news in your inbox: SUBSCRIBE TO THE HELLO AFRICA NEWSLETTERFOLLOW News24 Africa on Twitter and Facebook.