(FILES) US President Donald Trump looks on before signing an executive order calling for more research and flexibility on vaccines, in the Oval Office of the White House in Washington, DC, on August 10, 2026. A month before the US midterms, Democrats are eyeing control of Congress -- and the power to put Donald Trump on the defensive for the rest of his term, investigating his administration and stalling his agenda. The November 3, 2026, vote is shaping up as a verdict on one of the most turbulent presidencies in US history -- and by several measures, Trump goes into it less popular than any predecessor facing a midterm in modern polling. (Photo by Jim WATSON / AFP via Getty Images)