President Trump on Saturday signed an executive order seeking to hasten research into the therapeutic benefits of LSD, Ecstasy, psilocybin and other mind-altering drugs by ordering federal agencies to ease restrictions that have long limited the ability of scientists to study them. The measure also provides $50 million for state-level research into ibogaine, a powerful psychedelic made from the root of a Central African shrub that has been drawing interest from researchers for its potential to treat opioid use disorder and other forms of substance abuse.