How did his Zambia jaunt backfire and how did he attempt to interfere with another state?

His jaunt was far more successful than he could have dreamed - he got thrown out of Zambia, publicly, for doing nothing more heinous than wanting to sit in on a trial. It got him far more mileage than he would have had the Zambians simply let him in, and it exposed the current Zambian government for what they are. Classic Streisand effect. He must have been grinning from ear to ear when that plane took off from Lusaka. I would have been.