Zacharias gave Percy a rather pointed look. He was never particularly fond of defending himself, but he wasn't impossible of it. "You are aware that all segments for Loose Ends are opinion pieces, yes?" That was the first place to start - reinforce the fact that it wasn't an unbiased news piece.
"Macmillan, Granger, Goldstein, and your brother, Ron, were named as examples of the point. They are people who hold significant positions within the ministry and yet have ongoing ties to Dumbledore's Army, which is active once more." Zacharias didn't know for sure if they were involved, but he seriously doubted that Justin could organize the thing on his own. And now that he thought of it, the people who had been at Justin's party were mostly former DA people. While they could just have maintained that friendship, there was likely something more happening.