Robinhood, Interactive Brokers restrict trading in GameStop stock and options

Amid the flurry of speculative activity in GameStop, brokers took steps to restrict the trading in GameStop stock and options and other related securities. Free-stock trading pioneer Robinhood and Interactive Brokers both took steps to curb the wild trading activity in heavily shorted names on Thursday. CNBC's Carl Quintanilla and David Faber report.