Trump rallies in Pennsylvania for Senate hopeful Oz
STORY: Candidates endorsed by Trump will contest Republican primaries that will set the stage for November's midterm congressional elections.
Earlier in the week, Trump's pick, author JD Vance, won the Republican nomination to run for the U.S. Senate in Ohio, beating out former state treasurer Josh Mandel.
Victories in May by some of Trump's more controversial Senate picks, including former football star Herschel Walker in Georgia and Oz in Pennsylvania, are not guaranteed successes in the Nov. 8 general elections and missteps could allow Democrats to hold onto their razor-thin Senate majority.
