Ironically, Mattis is conveniently on vacation at the time of this announcement.
OT: It's a shitty, politicized decision that the Trump administration is throwing out for his base that only continues to show a trend where he has no interest in doing anything considered "moderate".
Though to be completely honest, this decision has Pence's stench on it far more than Trump. I'm not going to say he's supportive of LGBT rights, but he comes off as far more ambivalent than many others in his administration. He's just as shitty for going along with it.