President Trump's approval rating increased to 45 percent in the first week of December, the highest mark he's received since September, according to a Morning Consult/Politico poll released Wednesday.

Update: Trump celebrates his 45 percent approval rating

The majority of voters, 51 percent, did not approve of Trump's job in office. But his approval rating in the Dec. 1-3 survey is the highest since a Sept. 29-Oct. 1 poll in which he was also at 45 percent. He has not been higher than 45 percent since early July. He then dipped in August in the wake of his reaction to violence in Charlottesville, Va.

Three-in-five voters saw Trump as reckless and 54 percent said he is sexist. Another 47 percent of respondents said he is racist, but 39 percent said he is not.

Forty-six percent viewed the billionaire businessman as knowledgeable, and 44 percent disagreed.

The online survey was conducted with 1,997 registered voters nationwide and had a 2 percentage point margin of error.