pioneer has bested the president of the United States at his own game: Twitter trolling.The back-and-forth started in response toGreta’s powerful speech the news on Instagram, posting a cute photo of the newborn giving his proud papa a fist bump. “Your mama and papa got this,” he wrote. “Trust in us to guide and protect you always. To lay the tracks so your choo choo train will run smoothly throughout this world🚂. You will have all the tools to soar! We love you, and are so thankful for your arrival! The adventures are just beginning." In fact, he's actually defending Josh against fans who got mad at him over the wedding snub. "That’s my bro you know?" he said. "It’s kind of one of those things where you’re fighting with him on the playground, but if someone else says something, you’re like – 'Hey, I can say that but you can’t!'" Lauren Jauregui May Have Just Revealed Her Next Solo CollaboratorAfter a months-long hiatus from social media,Taylor Swift