D.J. Daniel, the 13-year-old brain cancer survivor who showed great courage at President Donald Trump’s address, has advised the president's adversaries to back off. Daniel, who charmed all with his appearance during a joint session of Congress on Tuesday, issued a firm but polite warning to the president’s detractors during an appearance with “War Room” correspondent Natalie Winters. “Please stop being mean to President Trump because if I see you being mean to him, I’m coming after you,” Daniel said on Steve Bannon’s “War Room,” in an interview Winters posted on X. Daniel, who was diagnosed with cancer in 2018,...