“Perhaps I should have done it while I was president,” Trump wrote.
The kidnapping at a government school is just the latest in a series of abductions that have plagued northern Nigeria in the past few months.
The president claimed that Boko Haram has a new leader, and said the fight against the Nigerian militant group would be over "before the end of the year."
In this excerpt, VICE News correspondent Kaj Larsen embeds with an operational air wing provided by private military contractors to the Nigerian military for their assault on the city of Bama.
At an abandoned Maiduguri airport in northeast Nigeria, a platoon prepares and what has become a de facto staging base for a series of military counter offensives against Boko Haram.