Nikki Haley, who's campaign recently $1 million in just 24 hours, continued to criticizes Donald Trump on Wednesday night, prompting a debate challenge and highlighting his perceived insecurities and mental fitness.  Trump, in response to the growing excitement around Haley, threatened to blacklist donors to her campaign.   The Morning Joe panel dives into the growing tensions within the Republican Party as it navigates its leadership and strategy ahead of upcoming elections. » Subscribe to MSNBC: https://www.youtube.com/msnbc Follow MSNBC Show Blogs MaddowBlog: https://www.msnbc.com/maddowblog ReidOut Blog: https://www.msnbc.com/reidoutblog MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, The Beat with Ari Melber, Deadline: White House, The ReidOut, All In, Last Word, 11th Hour, and Alex Wagner who brings her breadth of reporting experience to MSNBC primetime. Watch “Alex Wagner Tonight” Tuesday through Friday at 9pm Eastern. Connect with MSNBC Online Visit msnbc.com: https://www.msnbc.com/ Subscribe to the MSNBC Daily Newsletter: https://link.msnbc.com/join/5ck/msnbc-daily-signup Find MSNBC on Facebook: https://www.facebook.com/msnbc/ Follow MSNBC on Twitter: https://twitter.com/MSNBC Follow MSNBC on Instagram: https://www.instagram.com/msnbc Mika: Nikki Haley represents the last best hope for the Republican Party #NikkiHaley #Trump #GOP