'Noises' detected during submarine search, Tim Scott demands answers from Biden and more top headlines

An undated photo shows tourist submersible belongs to OceanGate descents at a sea. Search and rescue operations continue by US Coast Guard in Boston after a tourist submarine bound for the Titanic's wreckage site went missing off the southeastern coast of Canada. SEARCH FOR THE SUB – 'Underwater noises' detected by aircraft during rescue efforts for missing sub, Coast Guard says. 'SOME EXPLAINING TO DO' – GOP presidential candidate Tim Scott demands answers from Biden over Hunter plea deal. TAKING THE HOT SEAT – Durham to testify at House hearing after finding flaws in Trump-Russia investigation.