President Donald Trump faced mounting congressional opposition Tuesday over an agreement to bring Russian diesel into global energy markets, while a federal investigation involving Democratic Rep. Ilhan Omar raised questions about law enforcement and political accountability. Kimberly Guilfoyle resigned as U.S. ambassador to Greece amid allegations of improper conduct, and global technology shares fell sharply as investors reassessed the artificial intelligence boom. Meanwhile, renewed attacks in the Middle East kept energy markets unsettled, adding pressure to an already difficult inflation outlook ahead of November's U.S. midterm elections.