With the final primaries of the 2016 nomination season approaching, a new CNN Poll of Polls finds the candidates most likely to lead their parties into the general election are locked in a tight contest. Hillary Clinton holds an average of 45% support while 43% back Donald Trump across five recent nationwide polls of registered voters.

The presumptive Republican nominee is reintroducing Americans to a panoply of dormant scandals, personal transgressions and partisan controversies that rocked Bill Clinton's White House and first lady Hillary Clinton in two turbulent presidential terms leading up to the end of the 20th Century.

On a campaign swing through Puerto Rico Tuesday, the former president was asked by a reporter whether he had any response to Trump's latest attack on Twitter -- alluding to his past infidelities and charging that he was the "worst abuser" of women in U.S. political history. "No.

The GOP front-runner has ratcheted up his rhetoric against presumptive Democratic nominee Hillary Clinton in recent weeks, calling her a "crooked" politician who is unqualified to be president. But when it comes to her challenger, Bernie Sanders, Trump has taken a notably softer tone, praising the Vermont senator's rhetoric and encouraging him to launch a third-party bid.

Within minutes of each other, the pair issued statements saying they will divide their efforts in upcoming contests with Cruz focusing on Indiana and Kasich devoting his efforts to Oregon and New Mexico. The strategy is aimed at blocking Trump from gaining the 1,237 delegates necessary to claim to GOP nomination this summer.

Clinton didn't take any shots at Sanders during her first post-New York rally on Wednesday night, instead delivering her standard stump speech and casting the April 26 primaries in Pennsylvania, Delaware, Connecticut, Rhode Island and Maryland as a "great opportunity to start us on the path to the White House."

Wildcard North Korea is edging closer to its goal of building a viable nuclear device, Pakistan continues to amass nuclear material at unmatched rates, and Russian officials openly discuss pre-emptive nuclear strikes on Europe. And the sharpening skills of computer hackers mean cyber threats to nuclear facilities are increasing, too.

Obama and Cuban leader Raul Castro will shake hands at the Palace of the Revolution in Old Havana, the third time the pair have met for bilateral talks since the resumption of diplomatic relations in 2014. It was unclear whether the leaders would take questions from the press.

The New Narrative, after five more states voted Tuesday: Donald Trump won big and continues his march toward the Republican nomination. He won at least three, and possibly four, of Tuesday's contests. (That's not counting the Northern Marianas islands, where he won all the available delegates.)

A former State Department official has told lawmakers that Hillary Clinton allies privately removed politically damaging documents before turning over files to the supposedly independent board investigating the Benghazi terror attack. The account from Raymond Maxwell, former head of the Bureau of Near Eastern Affairs (NEA), was first published in The Daily Signal.