Around the World in 60 Seconds: Today's top stories

Here’s a brief look at some of the top news stories around the world for July 14, 2015.

Historic Iran nuclear deal is reached

Iran and world powers reached a historic deal early Tuesday for Tehran to curb its nuclear program in exchange for the easing of economic sanctions. The Islamic republic has been negotiating with the U.S., Britain, France, Germany, Russia and China for years.

[Read more from NBC News]

Harper Lee's second book is released

The sequel to Harper Lee's seminal novel "To Kill a Mockingbird" hit the shelves in more than 70 countries today. But some have canceled their pre-orders of "Go Set A Watchman" after it was revealed "Mockingbird" hero Atticus Finch has been depicted as a segregationist in the follow-up.

[Read more from the Wall Street Journal]

Trump leads GOP field, but lags behind Clinton

Donald Trump has surged to the top of a crowded Republican presidential field, according to a USA Today/Suffolk University Poll, but the billionaire is also the weakest competitor among the top seven GOP candidates against Democrat Hillary Clinton.

[Read more from USA Today]