Morning Bid: AAA fears vie with AI frenzy

A look at the day ahead in U.S. and global markets from Mike Dolan Two of the year’s dominant themes vied for investor attention overnight as the debt ceiling impasse threatened the U.S. government’s credit rating and chipmaking giant NVIDIA NVDA.O soared almost 30% on the artificial intelligence boom. Even though White House and congressional Republican negotiators signalled some progress in debt limit talks, credit rating firm Fitch put its U.S. sovereign “AAA” rating on ‘negative watch’ due to rising risks the debt ceiling won’t be raised before June 1’s ‘X-date’ when Treasury runs out of money. The tension further…