I didn't say slander because I'm not a lawyer.
"Everywhere Marie Yovanovitch went turned bad," Trump tweeted out as Yovanovitch spoke. "She started off in Somalia, how did that go? Then fast forward to Ukraine, where the new Ukrainian President spoke unfavorably about her in my second phone call with him."
Show me one moment in which Obama engaged in this kind of rhetoric concerning ANY former ambassador, let alone one whose work at the State Department earned not one ambassadorship but three.
By the way, none of those three were Somalia.
An ambassador is not placed to fix a nation's internal problems. The second they start to value their assigned nation's priorities as anywhere close to those of the US, they get pulled out, and they don't ever get another ambassadorship.
Ukraine was her third. There is no doubt that her loyalties lie with her country.