These are the headlines you Need2Know:
* **Trump Threatens Iran on Twitter:**
President Trump lashed out against Iranian President Hassan Rouhani late Sunday, warning him -- in an all-caps [tweet](https://twitter.com/realDonaldTrump/status/1021234525626609666) -- to "never, ever threaten the United States again or you will suffer the consequences the likes of which few throughout history have ever suffered before." His tweet comes in response to Rouhani's warning to Trump that "war with Iran is the mother of all wars." Read the details on [NPR.](https://www.npr.org/2018/07/23/631454795/trump-to-irans-president-never-ever-threaten-the-u-s-again)
* **Deadly Shooting in Toronto:**
Two people died and a dozen others were wounded in Toronto after a shooter opened fire in a popular neighborhood late Sunday. Neither of the victims has been identified. Authorities say the gunman is also dead, and they are now investigating the motive behind the shooting. Read the latest on [CNN.](https://www.cnn.com/2018/07/22/americas/toronto-restaurant-shooting/index.html)
* **Mourning Boat Accident Victims:**
The 17 victims of the duck boat accident in Missouri were remembered in a service on Sunday near the site of the accident. The memorial came as federal investigators are examining the boat's black box and video footage. Read more at [CBS News.](https://www.cbsnews.com/news/branson-community-mourns-missouri-duck-boat-victims-today-2018-07-22/)
* **Italian Wins the British Open:**
Francesco Molinari claimed the Claret Jug on Sunday, becoming the first Italian to win a major. He outlasted Tiger Woods, Jordan Spieth, Rory McIlroy and others to secure the prize. Read more at [BBC.](https://www.bbc.com/sport/golf/44918313)
Cheddar's Hope King gets into the latest.
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A federal judge on Tuesday will consider whether Texas can keep a floating barrier on the U.S.-Mexico border as both the Biden administration and Mexico push to remove Republican Gov. Greg Abbott's latest hardline measure to deter migrants from crossing.
As the Biden administration makes billions of dollars available to remove millions of dangerous lead pipes that can contaminate drinking water and damage brain development in children, some states are turning down funds.
It's almost time for the first debate among Republicans competing for their party's 2024 presidential nomination. Here's all of the information on how to watch.
Canadian Prime Minister Justin Trudeau accused Facebook on Monday of putting profits over people’s safety during the emergencies created by Canada’s record wildfire season.
For foreign workers, Lahaina was an oasis. But after fires whipped by hurricane-force winds leveled the town earlier this month, many have lost their lives, livelihoods and even their documents.
Authorities in Georgia said Thursday they're investigating threats targeting members of the grand jury that indicted former President Donald Trump and 18 of his allies.
Nine current or former Northern California police officers were charged Thursday in a federal corruption investigation that found evidence they committed civil rights violations and fraud in an effort to get a pay raise and lied on reports to cover up the use of excessive force, U.S. authorities said.
President Joe Biden opened a historic summit with Japan and South Korea at Camp David on Friday focused on strengthening security and economic ties at a time of increasing concerns about North Korea’s persistent nuclear threats and China’s provocations in the Pacific.
