Republican Sen. John McCain said Thursday that President Barack Obama is "directly responsible" for the mass shooting in Orlando, Florida, because of the rise of the Islamic State group on the president's watch.

There's no evidence so far that the Orlando massacre at the hands of gunman Omar Mateen was orchestrated by an overseas terrorist organization, says CIA Director John Brennan.

The father of Omar Mateen, the man who murdered 49 people at an Orlando gay bar Sunday morning, isn't convinced his son came up with the attack plan on his own.