So we should expect his nomination or his statement to be withdrawn after Wayne LaPierre makes a call to Trump.
Trump's response to the question of extreme vetting of gun owners made no sense. There was no evidence that the shooter intended to kill "hundreds more" outside the church. If there was more scrutiny of who can purchase guns, the shooter wouldn't have been able to purchase the weapon, and if the neighbor passed the scrutiny he would still have had his gun. Just the opposite of Trump's explaination. And regardless, the shooter killed himself, not the neighbor.
Not to mention that Trump reversed an Obama order to further scrutinize potential gun buyers with mental disorders, and then claimed it was a mental health issue.