It's a negative for Westinghouse and CBI does not want to be part of Westinghouse's problem. Comments by Westinghouse can't help Westinghouse in any in manner, better to keep quiet until issue is resolved.
Some stocks because of their level of risk have a higher than 50% equity requirement subject to change at any time, I believe at the option of the brokerage company. This translates also into a higher maintenance margin requirement. You should check with your broker to get a list of the stocks requiring higher equity requirement.