These are the headlines you Need2Know:
* **Toronto Shooter Had Tumultuous Mental History:**
The parents of slain shooter Faisal Hussain went public on his history of mental illness, but officials have not yet identified his motives. The 29-year-old shot and killed two and wounded at least a dozen on Sunday. Read the details [here](https://www.cnn.com/2018/07/24/americas/toronto-shooting-investigation/index.html).
* **Umbrellas Up, Northeasterners!:**
A flash-flood warning is in effect after heavy rainfall has flooded several Pennsylvanian towns. In Scranton, certain parts of Hershey park are submerged in water. See the map [here](https://twitter.com/NWS/status/1021536276095426560).
* **Twitter War Forges Ahead:**
Following President Trump’s all-caps [Twitter](https://twitter.com/realDonaldTrump/status/1021234525626609666) threat to Iranian President Hassan Rouhani, the Iranian Foreign Minister Mohammad Javad Zarif fired back on Monday, warning the U.S. to, “BE CAUTIOUS!” Read the full subtweet from Zarif [here](https://twitter.com/JZarif/status/1021471196242735104).
* **North Korea Tunes it Down:**
Just over a month after Trump met with North Korean leader Kim Jong-un in Singapore to discuss denuclearization, the country is dismantling several ballistic missile launch sites. Stay with the story [here](https://www.theguardian.com/world/2018/jul/24/north-korea-satellite-images-show-dismantling-of-missile-test-facilities-report).
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New Zealand acknowledged it has an aging Boeing 757 so prone to breakdowns they had sent an empty backup to ensure Prime Minister Chris Hipkins didn't get stranded in China, where he is leading a trade delegation.
Delaware state Sen. Sarah McBride announced Monday she's running for the U.S. House of Representatives. Already the first openly transgender state senator elected in the country, she'd be the first transgender member of Congress if she wins in November.
U.S. states could face some hurdles as they experiment with road usage charging programs aimed at one day replacing motor fuel taxes, which are generating less each year, in part due to fuel efficiency and the rise of electric cars.
The defiance of restrictions in North Dakota on what bathrooms transgender students can use in public schools and universities shows that it's not exactly clear how bathroom laws will play out in local communities after being enacted in at least 10 states with Republican-controlled legislatures.
The Supreme Court on Monday left in place an appellate ruling barring a North Carolina public charter school from requiring girls to wear skirts to school.
The U.S. Department of Transportation is awarding almost $1.7 billion in grants for buying zero- and low-emission buses, with the money going to transit projects in 46 states and territories.
Vice President Kamala Harris said Supreme Court conservatives caused a healthcare crisis in America and blasted abortion bans in Republican-led states.
