Five Things You Need to Know to Start Your Day

American federal judges rule against Trump's Chinese app bans. The U.S. plans more sanctions on Iran. And a record ban on short-selling in South Korea fuels bubble fears. Here are some of the things people in markets are talking about today.

The Trump administration failed to prove Chinese-owned TikTok and WeChat pose enough of a national security threat to justify an American ban, two federal judges have ruled this month. U.S. District Judge Carl Nichols in Washington said in a court filing Monday that he blocked a ban on new downloads of TikTok because the government likely overstepped its authority under the emergency-powers law it invoked to justify the prohibition. Earlier, U.S. Magistrate Judge Laurel Beeler in San Francisco blocked a similar ban on WeChat. The decisions show that, while judges may agree with the notion that China poses a threat, the administration hasn’t yet shown that the apps themselves are a problem.