Senator Mitch McConnell, the 84-year-old Kentucky Republican and former leader, had been absent for more than 13 weeks after a health incident, fueling questions about his ability to continue serving.
The kingdom is in a state of strategic shock after coming under attack from an emboldened Iran and failing to win more U.S. military support, analysts say.
In a 3,800-word essay, Dario Amodei laid out the rapidly advancing capabilities of artificial intelligence and said there needed to be greater safety controls across the industry.
The contractor said the pool's new blue liner peeled and tore because of "human oversight" and a flawed plan that involved layering two incompatible chemicals, documents show.