NEW : PRISM : UK requested that Snowden not be permitted to board flight to UK . Holder said the leaks are under investigation . Angela Merkel went public about the surveillance program just days . Asian leader Angela Merkel says she aims to talk about PRISM program with Obama .
NEW : Singapore Airlines : Britain requested that Snowden not be permitted to board flight to UK . Holder said the leaks are under investigation . Edward Snowden went public about the surveillance program Sunday . German leader Angela Merkel says she aims to talk about PRISM program with Obama .