WASHINGTON (Reuters) - President Donald Trump said on Thursday his decision on whether to approve a potential deal involving U.S. companies taking a greater ownership share of Chinese social media app TikTok will hinge primarily on the issue of safety. “They’re working to see if they can make a deal,” he told reporters, adding that if a deal is made, it will be presented to him. “I’ll either ... approve it or not. To me, safety is the predominant factor.”