For the first six minutes of the segment, “Fox & Friends” host Steve Doocy agreed enthusiastically with his guest Mehmet Oz, better known as Dr. Oz — even as Tuesday’s episode kept straying from the original topic of Ivanka Trump’s pregnancies. When Dr. Oz lamented the “continuous barrage of criticism” that Ivanka and her father have faced in the White House, Doocy agreed. “It’s nonstop,” he said, hand on knee, leaning toward Oz on the far end of a cream-colored sofa. “She sees this as a service to the country,” Oz said. “For the greater good!” Doocy said. From there, they got into the country’s opioid epidemic, one of President Donald Trump’s priorities. “That’s a very important thing,” said Doocy’s co-host, Brian Kilmeade, tossing his notes to the coffee table as if to signal that the segment was over. Except. “Can I ask you one thing?” Oz said, suddenly talking very fast. “I talked about the opioid epidemic, but the real story is the hypocrisy around medical marijuana.” Now Doocy tensed up, one hand clutched in the other, a tight ball of fingers beneath a deep frown.