Mr. Kyl, appointed after the death of John McCain, will depart on Dec. 31. Gov. Doug Ducey and Republicans in Washington may differ over who should be named to replace him.
One of the main voices in the campaign for Britain to leave the European Union is ready to rejoin the fray if Britain’s departure seems endangered.
Demonstrations and walkouts took place in solidarity with Christine Blasey Ford and Deborah Ramirez, who have accused the Supreme Court nominee of sexual misconduct.
She gave up designing skyscrapers to develop structures that would help travelers live on the International Space Station, Mars or the moon.
A rash of news stories this week stemmed from a misinterpreted NASA update from January.