7 things to know now: Louisiana flooding; Trump vetting; the Biebs Instagram meltdown

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

What to know now:

1. Extreme vetting: Republican nominee for president Donald Trump is calling for "extreme vetting" of anyone who wants to immigrate to the United States. In a policy speech Monday in Ohio, Trump proposed the new screening tool that would "only admit into this country those who share our values and respect our people." Trump said "extreme vetting" would help in screening out "sympathizers of terrorist groups," and "…screen out any who have hostile attitudes toward our country or its principles or who believe that Sharia law should supplant American law."

2. Rio Games: Gymnastics competition ends today in the Rio Summer Games. On Monday, Simone Biles had a bobble on the balance beam that cost her the Gold medal. She won the bronze medal. The focus will move to track and field where Usain Bolt will be racing  in the 200-meter and American Christian Taylor will defend his triple jump title.

3. Flooding fears: At least seven people have died in flooding in Louisiana, and on Tuesday, the area is bracing for more rain. The rainfall, which now sits at 31 inches in some places, has caused rivers to flood in the Baton Rouge area, displacing some 12,000 people, according to the state's governor. More than 40,000 homes are without power.

4. Aetna drops Obamacare policies: Insurance giant Aetna announced Monday that it is all but leaving the Affordable Care Act network. For 2017, the company will stop offering policies in 11 of the 15 state exchanges it currently operates in.  The company said it has lost $430 million in individual policies since the federal healthcare program went into effect.

5. Nazi gold train: A rumor of a Nazi train that outran an advancing Soviet Army at the end of World War II – one that was supposed to be filled with gold, jewels and artwork – has persisted for some 70 years. Many say it's only legend, but on Tuesday, a group will begin the search for that train and its treasures as they dig for a tunnel believed to be near Wroclaw, Poland.

And one more

If you are a Belieber, you may want to cover your eyes as you read this. Justin Bieber has made good on his promise to leave Instagram. The whole nasty affair began when people began to make rude comments about  Bieber's latest girlfriend – Sofia Richie, daughter of singer Lionel Richie. "I'm gonna make my Instagram private if you guys don't stop the hate," Bieber warned.  The hate talk continued, apparently, because Bieber shut his account down Monday. Now, you would think that is all there is to that, but there was a twist: Bieber's former girlfriend, Selena Gomez, decided to weigh-in on the issue by telling him to calm down because his fans actually love him. Not what he wanted to hear -- his response:  "It's funny to see people that used me for attention and still try to point the finger this way. Sad. All love." Cool we guess, as long as it's "all love."

In case you missed it

A little more about the Olympics