Prosecutors say that former pharmaceutical executive Martin Shkreli should be sentenced to no less than 15 years in prison for his three securities fraud convictions, a term that would be more than 10 times longer than the maximum Shkreli’s defense team has argued should apply.

Shkreli, 34, was convicted in August of two counts of securities fraud and a related conspiracy charge and was acquitted on five additional counts related to a scheme in which he defrauded investors in two of his hedge funds, eventually paying them back with assets from a pharmaceutical company he founded.