A missile attack on Saudi Arabia’s International airport in Riyadh left 12 people dead, including an American, and more than 300 injured. A Saudi-led coalition blamed Iran-backed Houthi rebels for the attack, and President Trump indicated that he is weighing whether the U.S. should join Saudi strikes against the Houthi rebels in neighboring Yemen. Plus, Trump is calling on Ukraine to replace President Volodymyr Zelenskyy after he criticized Trump’s deal to allow Russia to export diesel to the U.S.. MS NOW Senior National Security Reporter David Rohde joins “The Weekend” to discuss.