Tariffs in doubt, Musk's pay plan, shutdown flight reductions and more in Morning Squawk

1. Supreme Court questions legality of Trump's tariffs, impacting market sentiment. 2. Stocks gained as court may rule tariffs invalid, signaling potential relief. 3. Tesla's CEO pay proposal faces opposition from key shareholders and advisers. 4. Air traffic control staffing cuts could disrupt airline operations significantly. 5. Snap shares rose 20% post-earnings, while Pinterest fell over 20%.