Trump, as expected, signed a flurry of executive orders on his first day back in office. Some, such as border- and immigration-related actions, are likely to directly affect Arizonans. Others, such as an effort to undo electric auto production, could have second-order relevance.

In the 6 p.m. hour, Mr. Trump signed more orders before a packed Capital One Arena, in Washington, D.C. Among them, a requirement that federal workers return to full-time work in person immediately, a freeze on all federal hiring, except by the military and some other excluded categories.