5 Things to Know This Morning

May 15, 2013— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. Management Blamed for IRS Troubles
A Treasury Inspector General report obtained by ABC News says ineffective management at the Internal Revenue Service led to certain groups being singled out for more than 18 months based on their names or mission statements.

2. Hagel Demands New Sex Assault Prevention Training
Defense Secretary Chuck Hagel has ordered all of the military's sexual assault prevention coordinators and military recruiters to be re-trained, re-credentialed and re-screened after the Air Force's sexual assault prevention officer was arrested for allegedly groping a woman, as well as the release of new statistics showing sexual assaults in the military are on the rise.

3. US Ambassador Summoned by Russian Foreign Ministry
The U.S. ambassador to Russia was summoned to the Russian Foreign Ministry today for a formal protest over Moscow's claim that it caught a U.S. diplomat disguised in a wig trying to recruit a counterintelligence officer for the CIA, reports the AP.

4. Harry Closes US Visit With Polo Match
Prince Harry winds down his weeklong visit to the United States by competing at the Greenwich, Conn., Polo Club to benefit a charity today.

5. Powerball Jackpot Climbs to $360M
Tonight's Powerball jackpot has swelled to a robust $360 million after no one matched the winning numbers during the weekend drawing, making it the third-largest Powerball jackpot of all time.