A Florida man who mailed crudely made pipe bombs to prominent critics of President Donald Trump said he abused steroids for over 40 years, an issue his lawyers say they'll cite at sentencing.

Cesar Sayoc made the assertion in lengthy and rambling letters to a federal judge that were posted in his court case file Tuesday.

Sayoc, 57, pleaded guilty to explosives-related charges in March and faces a mandatory 10-year prison term and up to life in prison when he's sentenced Aug. 5. His lawyers told the judge in a different letter that a psychiatrist with specialized knowledge of the effects steroids can have on mental health will compose a report on Sayoc's extensive steroid use prior to that sentencing date.