One of the driving themes of President Trump's first five months in office is the rollback of his predecessors policies. This week Trump restored restrictions on trade and travel to Cuba. One area where he's extending Obama-era policies is immigration. Trump extended protections for dreamers, the undocumented immigrants who came to the United States as children.

After a series of terror attacks in Brussels killed more than 30 people, including two Americans, the United States has renewed its fight against Islamic State militants. Defense Secretary Ash Carter announced that a special operations team killed ISIS' second-in-command in a raid this week.

President Obama is on the last day of his historic three-day trip to Cuba after restoring diplomatic relations with the island nation for the first time in half a century. "I have come here to bury the last remnant of the Cold War in the Americas," Obama said. "I have come here to extend the hand of friendship to the Cuban people."

President Obama visits Cuba next week for the first time since the U.S. restored diplomatic relations with the island nation. Obama will be the first president to visit Cuba since Calvin Coolidge in 1928. The New York Times' Peter Baker says this is one of the last big bucket list items for Obama.

The Iowa State Fair kicked off this week with hopeful 2016 candidates hoping to win the support of party faithful in the nation's first caucus state. Meanwhile, email troubles continue to plague Hillary Clinton's presidential campaign. The Washington Post’s Karen Tumulty and CNBC’s John Harwood explain which candidates had a good week and which have seen better.

Lawmakers reached an agreement this week that allows Congressional review of any Iran nuclear agreement. POLITICO's Manu Raju explains how Congress reached the bipartisan deal, and The New York Times' Peter Baker explains why President Obama agreed.

President Obama's State of the Union was met with pushback from the Republican-controlled Congress, but where is there room for compromise on the president's 2015 legislative agenda? Alexis Simendinger and Ed O'Keefe report on the president's proposals for community college and trade as well as the Republican opposition.

The United States and Cuba have commenced talks aimed at normalizing long-strained relations, but support for this turning point is not universal. Gwen Ifill talks to Indira Lakshmanan of Bloomberg News from Havana about opposition from Capitol Hill and the long process of reestablishing the relationship after 53 years.

On the Webcast Extra, NPR’s Tom Gjelten details what the new Cuba regulations mean for the individual traveler. Robert Costa of The Washington Post explains how the GOP is using immigration as a strategy for 2016 and what to watch with potential Democratic candidates. Joan Biskupic of Reuters delves deeper into the Supreme Court and same-sex marriage.

In 2014, ISIS, Boko Haram and Crimea became household names and Ebola re-entered the scene as a medical crisis. Gwen Ifill speaks with Indira Lakshmanan of Bloomberg News, David Ignatius of the Washington Post and David Miliband of the International Rescue Committee about this past year’s biggest global challenges, and what conflicts to expect in the coming year.