7 things to know now: Trump remarks; more Clinton emails; woman shot, killed in police demo

Here's a roundup of news trending across the nation and world today.

What to know now:

1. Trump Second Amendment remarks: Donald Trump has ignited yet another controversy with comments he made about Hillary Clinton at a rally Tuesday. Many took his comments about people who support gun ownership as a threat to her life. "Hillary wants to abolish -- essentially abolish the Second Amendment. By the way, if she gets to pick, if she gets to pick her judges, nothing you can do, folks. Although the Second Amendment people, maybe there is, I don't know," Trump said. Trump has received criticism from both sides over the remarks. Trump's campaign says he was not suggesting someone harm Clinton, but, instead, that people who support the Second Amendment can come together as a group to vote against Clinton in the general election.

2.  Clinton email, Foundation questions: The group Judicial Watch has made public a previously unreleased batch of emails from Hillary Clinton's personal server. Among the 296 pages released Tuesday was an exchange that showed an aide to Bill Clinton seeking a meeting between a top donor to the Clinton Foundation and State Department officials. The Wall Street Journal reported that "in an exchange from April 2009, a longtime aide to Mr. Clinton told three of Mrs. Clinton's top advisers that it was "important to take care of" a particular person, whose name has been redacted from the document."

3.  Olympic Super Tuesday: It was the best of times for some at the 2016 Summer Olympic Games, but for others, it was a shocker. Serena Williams was knocked out of the Rio Games after losing to Elina Svitolina. On the flip side, the USA Women's gymnastics team won gold in the team competition. The most exciting event from Tuesday came from the pool with Michael Phelps winning his 20th and 21st Gold medals. The Games continue Wednesday in Rio with boxing and cycling events.

4. Paul Ryan wins: U.S. House Speaker Paul Ryan won his Republican primary Tuesday, defeating challenger Paul Nehlen in the election in Wisconsin's 1st congressional district. Ryan moves on to the general election in November.

5.  Shooting at demonstration: A Florida police officer accidentally shot and killed a woman who was helping him in a demonstration in which he was role playing the "bad guy," and she was "the victim." A Punta Gorda (Fla.) officer shot the woman with live ammunition instead of blank rounds, according to police officials. Punta Gorda police Chief Tom Lewis said the shooting happened as the woman and officer were demonstrating a "shoot or don't shoot" scenario.

And one more

A hearing into allegations that actor Johnny Depp physically abused his estranged wife, Amber Heard, has  been delayed by two days.  Heard is looking to have a restraining order against Depp extended. Heard claims Depp physically abused her since they were first together as a couple in 2011. She and Depp were married in 2015.

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