WASHINGTON, D.C. -- President Donald Trump's job approval rating increased relatively sharply over the past month to 45% in an April 1-9 Gallup poll, up from 39% in March. This marks the third time the 45th president has reached a 45% job approval rating in Gallup trends -- his highest in the series.

This is Gallup's first measurement of presidential approval since special counsel Robert Mueller completed his investigation into Russian attempts to sway the outcome of the 2016 presidential election. Attorney General William Barr's synopsis of Mueller's findings reported no Russian involvement in the Trump campaign and insufficient evidence of obstruction of justice -- which Trump claims fully vindicates him.

Congress has raised questions about the attorney general's synopsis of Mueller's findings and is demanding to see the report. While this plays out, Americans are slightly more approving of Trump than they were before the report's delivery -- though a small majority (51%) still disapprove of the president.

Trump's previous 45% readings were recorded in his first week in office in January 2017, and again in June 2018 after his historic meeting with North Korean leader Kim Jong-un.

The president's improved rating is the result of small increases among independents and Democrats, whose ratings of the president have increased by six and four percentage points respectively. Republicans' approval of the president remains unchanged, with about nine in 10 Republicans approving of Trump's job performance.

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Explore President Trump's approval ratings and compare them with those of past presidents in the Gallup Presidential Job Approval Center.

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