KNOW IT ALL: Thursday's Top 7 Stories at NBC News

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In this undated publicity photo courtesy Running Press, Marilyn Monroe is shown wearing a knife-pleated gold lam? gown made from "one complete circle of fabric." She wore this dress in "Gentlemen Prefer Blondes."AP

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Good morning. Here are some of the headlines we're following this morning:

1. Here’s How Clinton Will Attack Trump in Policy Address

Hillary Clinton will deliver an aggressive policy address in San Diego on Thursday in an attempt to cast a Donald Trump presidency as a threat to national security. Read more in POLITICS.

2. Trump Unleashes Withering Personal Attack on Clinton

The presumptive Republican presidential nominee, whose campaign remarks are usually off-the-cuff, came prepared to attack his rival after Clinton called him a "fraud" for taking "advantage" of Americans through Trump University. Read more in POLITICS.

3. Clinton, Sanders in Dead Heat in Crucial Primary

Clinton is clinging to a narrow two-point lead over Bernie Sanders in California ahead of the state's June 7 primary, according to results from a new NBC News/Wall Street Journal/Marist poll. Read more in POLITICS.

4. UCLA Professor Killed in Apparent Murder-Suicide

The deceased, both males, died in a shooting Wednesday in a small office in the engineering building of the campus, police said. The victim was UCLA mechanical and aerospace engineering professor William Klug, whom California Lt. Gov. Gavin Newsom, in a tweet, said was a husband, father of two and "brilliant" teacher. Read more in NEWS.

5. Jimmy ‘Superfly’ Snuka Ruled Incompetent to Stand Trial

The pro wrestling star is mentally incompetent to stand trial in the death of his girlfriend more than three decades ago, a judge ruled Wednesday. Read more in NEWS.

6. More Americans Are OK With Same-Sex Sex: Poll

And you thought the 1970s were wild. A new study finds that Americans are more accepting than ever before of same-sex canoodling. And not only do they think it's OK — they're trying it for themselves. Read more in HEALTH.

7. Multiple Bodies Pulled From Burning N.J. Home

At least two bodies were pulled from a burning house in the New York City suburb of Fair Lawn after a fire was reported late Wednesday and was still smoldering early Thursday morning, police said. Read more at NBC NEW YORK.

Nightly Spotlight

The Hollywood icon has been copied and parodied over the years — but Marilyn Monroe has never been matched. And on what would have been her 90th birthday on Wednesday, her mystique lives on.