President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act 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 Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE, Hillary Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close 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 Kavanaugh Brett Michael KavanaughSenate GOP set to vote on Trump's Supreme Court pick before election Conservative groups unleash ad blitz in support of Barrett's nomination Two Judiciary Democrats say they will not meet with Trump's Supreme Court pick MORE.

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