I just don't see the point of continuing to attack somebody who has already lost. It's like when he kept calling Cruz "Lyin' Ted" long after he clinched the nomination. That didn't gain any votes, it just alienated Cruzers.
Asbestos on....
And even after Ted humbled himself before almighty Trump, the MAGA fans continued to bitch and moan about him, even today.
I'm rather neutral about Sanford -- don't love him, don't hate him. Whatever. It's just plain childish for the President of the United States to continue beating him up. And it's even worse that supposedly grown-up conservatives, many of whom profess to be Christian, think such adolescent behavior in a president is ok.