The most emotional moment of the Democratic National Convention was the speech by Khizr Khan, the bereaved father of Army Captain Humayun Khan. With his wife Ghazala by his side, Khan recalled his son’s character, his faith, his patriotism — and, ultimately, his courageous death in the service of the country he loved, and the fellow soldiers he was protecting.And, yes, the Khan family is Muslim. Under Trump’s proposed policies, they would be innately suspect; had he been president when they immigrated to America, they would’ve been barred from entering, and Humayun Khan never would have served."Have you ever been to Arlington Cemetery?" Khan asked Trump. "On ABC this morning, Trump responded to Khan’s speech. I don’t know what I expected from Trump. Maybe he would show some gentleness. Maybe he would show some empathy. Maybe he would refuse to comment. Maybe he would attack Hillary Clinton and Barack Obama’s foreign policy leadership. All of those responses would have been fine. Trump’s actual response, though, wasn’t fine.Let’s be very clear about what Trump is doing here: as ABC wrote,At this point, I honestly don’t know what to say. I don’t have new language for this, I haven’t found another way of saying this isn’t okay, this isn’t kind, this isn’t decent. Instead, I’ll note James Fallows’s response. He quotes Joseph Welch, speaking to Senator Joseph McCarthy in 1954.If you would like to see Ghazala Khan speak, you can do so in this interview she gave to MSNBC’s Lawrence O’Donnell. As Fallows writes, she breaks down sobbing while speaking of her son. It suggestsThis isn't partisan. This isn't left vs. right. Mitt Romney never would have said this. John McCain never would have said this. George W. Bush never would have said this. John Kerry never would have said this. This is what I mean when I write thatTrump also wanted the Khans to know that, like them, he had sacrificed for this country.I honestly do not understand how a human being can respond to a family that lost their son for this country by saying that he has sacrificed too, he’s worked really hard, he’s built "great structures," he's had "tremendous success."This is not a question that needs to be asked in most elections, but it needs to be asked in this one: what kind of person is Donald Trump? What kind of person says these things? And is that really the kind of person we want to be president?