The head of Liberia's drug agency says all students should be tested as a way to combat drug abuse.
Liberia was founded by freed slaves and the country has long-standing historical ties with the US.
At least three of the 25 people on board the Eternity C were killed after it was attacked by the Iran-backed group.
Trump told Boakai he speaks "such good English", asking where he went to school.
The presidents of Gabon, Guinea-Bissau, Liberia, Mauritania and Senegal hope to be offered "incredible" deals.
The Liberian-flagged Eternity C, carrying 22 crew, is reported to be adrift and listing.
William Tolbert was killed during the 1980 coup - his body was then believed to be dumped in a mass grave.
The blaze broke out a day after protests over plans to oust former speaker Jonathan Fonati Koffa.
Part of the presidential jet's landing gear malfunctioned while approaching the runway, authorities say.
