Ronny Jackson rose to national prominence as White House physician to three presidents—Barack Obama, Donald Trump, and briefly Joe Biden—before winning his deep-red Texas Panhandle congressional seat in 2020. The retired Navy rear admiral and emergency medicine physician became a fierce Trump ally, particularly after his glowing assessment of Trump's health generated controversy and his nomination for Veterans Affairs secretary was withdrawn amid workplace conduct allegations. In Congress, Jackson has positioned himself as one of the most vocal Trump supporters, frequently challenging the Biden administration on issues ranging from border security to the president's mental acuity.