Most Americans prefer politicians who work across the aisle, Democratic Sen. Kyrsten Sinema said Monday in a forceful defense of her brand of bipartisanship, which has infuriated the left and is likely to draw her a primary challenge.

Republican Senate candidate Blake Masters said Friday he hopes Senate Minority Leader Mitch McConnell will back his close campaign in Arizona, striking a magnanimous tone toward the GOP leader he fiercely criticized during the primary.

Arizona Gov. Doug Ducey has notified Senate Republican leader Mitch McConnell that he will not enter his state’s high-profile Senate contest, a disappointing development for establishment Republicans who saw Ducey as their best hope to defeat Democratic Sen. Mark Kelly ...