Meanwhile, the US president's disapproval rating increased four percentage points to 54 percent, the Gallup poll revealed.
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The poll was conducted on October 22-18 among 1,500 adults with a margin of error not exceeding 3 percent.
Trump has been actively campaigning on behalf of Republican candidates as the November 6 elections approach, in hopes of maintaining Republican majorities in both the Senate and House of Representatives, and bucking a historical trend in which a president's party loses seats during the midterms.