Trump issues ultimatum to Iran, Cuba plunged into darkness, ICE deployed to U.S. airports, and more

<p>As fighting appears to intensify in the Middle East, so does the rhetoric. U.S. President Donald Trump issued an ultimatum to Iran - telling Tehran if it doesn't allow ships through the Strait of Hormuz, then the U.S. will attack Iranian power plants. Iran's military is now calling Trump's bluff, threating to strike back.</p><p><br></p><p>Also: Power is slowly returning in Cuba after a nation-wide collapse of the grid left millions in the dark. It's the third blackout this month. Cuba is in the midst of an energy crisis brought on by a U.S. oil blockade. CBC News is on the ground in Havana, speaking to Cubans about how they are coping.</p><p><br></p><p>And: In a controversial move, Donald Trump has ordered ICE officers to help workers at the nation's airports. It comes as a partial government shutdown drags into a fifth week, leaving TSA workers without pay, and creating massive lines for travellers. And with the Spring Break travel rush looming, Congress is scrambling to find a...