Mina was scared when President Cameron picked up the glass of unknown liquid. While he had been the one to order it, she did not know what it was, or how long he had left it unattended. She may not have liked the man as a political figure, but he was an okay enough person, and the thought of him being poisoned on her behalf frightened her.
Fortunately, President Lee took the glass from his cousin, and downed the contents. Mina mistook his actions as him being offended on Lisa's behalf, but in truth, he just did not want his cousin to win any more points with her. He had seen how she warmed up to the man, and he feared that Zane was right. He had even gone as far as to pull his cousin to the side, letting him know what happened between himself and Mina, but Cameron was willing to overlook it.
"I want it on the record now that I played no part in having that man drink whatever was in that glass." Zane chuckled at Mina's reaction because he too thought she was being overly dramatic.