From the Weekly Standard:
We should be clear about this. John McCain haunts the Trump White House, not because of his votes or policy disagreements, but because he represents the man that Donald Trump cannot ever be.
McCain, who is battling brain cancer, is exiting the stage as a Man in Full, his integrity intact and intent on having the last word. With every passing day he sharpens the contrast between himself and the man in the Oval Office: In his final book, due out this month, he writes of Trump that “[f]lattery secures his friendship, criticism his enmity.” The former prisoner of war has also expressed his opposition to the nomination of Gina Haspel to lead the CIA.
“It doesn’t matter, he’s dying anyway,” White House aide Kelly Sadler reportedly quipped dismissively. Sadler’s crass comment drew angry and well-deserved rebukes. "People have wondered when decency would hit rock bottom with this administration,” former Vice President Joe Biden said in a pointed statement. “It happened yesterday."
Notably, the White House does not deny Sadler’s mockery. But on Friday, Trump’s press secretary, Sarah Huckabee Sanders, refused to apologize, expressing more concern about the leak than the attack itself. "I'm not going to get into a back and forth because people want to create issues of a leaked meeting.” The voluble Trump himself is also notably silent, unwilling to make a single gracious gesture or expression of regret.
None of this should be surprising, because in Trump World, the tone is set from the top.