Poll: Trump approval drops 4 points in a week
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President TrumpDonald John TrumpStates slashed 4,400 environmental agency jobs in past decade: study Biden hammers Trump over video of world leaders mocking him Iran building hidden arsenal of short-range ballistic missiles in Iraq: report MORE's approval rating dropped 4 points last week, essentially erasing the gains he made in Gallup polling during the previous four weeks.

The Gallup weekly approval rating tracker showed that Trump's approval rating dipped to 40 percent for the week ending on Sunday. Fifty-four percent of Americans now disapprove of the president's job performance, according to the poll.

The poll was conducted throughout a week that began with a Trump rally in Texas and questions about the killing of a Saudi journalist, and ended with a mass shooting at a synagogue in Pittsburgh.

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In between, the country was jolted by a string of explosive devices mailed to prominent Democrats including former President Obama, former Vice President Joe BidenJoe BidenGabbard moves to New Hampshire ahead of primary Biden hammers Trump over video of world leaders mocking him Trump's legal team huddles with Senate Republicans MORE, Hillary ClintonHillary Diane Rodham ClintonThree legal scholars say Trump should be impeached; one thinks otherwise Report: Barr attorney can't provide evidence Trump was set up by DOJ Jayapal pushes back on Gaetz's questioning of impeachment witness donations to Democrats MORE and others.

Authorities arrested Cesar Sayoc Jr. on Friday in connection with the mail bombs. The next day, a gunman killed 11 people at the Tree of Life Synagogue in Pittsburgh.

Trump urged unity in the aftermath of both incidents and condemned the violence. However, he quickly blamed critics and the media for fostering hostility across the nation, even as critics suggested his own rhetoric had inflamed tensions to a breaking point.

Monday's Gallup poll is based on a survey of roughly 1,500 Americans from Oct. 22 through 28. It has a margin of error of 3 percentage points.

Trump's approval rating in the Gallup poll had climbed to 44 percent in each of the past two weeks as the president and Republicans enjoyed a boost from the confirmation of Supreme Court Justice Brett KavanaughBrett Michael KavanaughHouse, Senate Democrats call on Supreme Court to block Louisiana abortion law Justices appear cautious of expanding gun rights in NY case Thanks to President Trump, major tests loom for Chief Justice Roberts MORE.

A RealClearPolitics average of surveys shows Trump's job approval at 44 percent.