Former drug executive Martin Shkreli plans to assert his right against self-incrimination and remain silent if he is forced to appear next week at a congressional hearing about drug prices, according to a letter seen by Reuters. Shkreli’s lawyer informed the U.S. House Committee on Oversight and Government Reform of his intent not to answer questions and asked that Shkreli be excused from appearing, committee chairman Jason Chaffetz wrote in the letter dated Wednesday to his lawyer, Baruch Weiss.