The majority of U.S. voters approve of President Trump's job in office, according to a new poll released Friday, marking the first time since May that he has enjoyed the support of more than half of voters.

The survey from the conservative Rasmussen Reports found that 51 percent of likely voters back Trump, compared to 48 percent who are discontent with his performance. Rasmussen's polling has been slightly more favorable for Trump than other pollsters'.

During his first month in office in Jan. 2017, Trump started with a mid- to upper-60s approval rating. However, starting in February, that number began dropping and hit its lowest point to date of 38 percent approval and 50 percent disapproval in August 2017.

His ratings have increased to average mid-40s both in approval and disapproval since January.

The slight spike in support for the Republican president comes in the midst of controversy surrounding the Senate confirmation of Supreme Court nominee Brett Kavanaugh following several accusations of sexual assault against him.

Republicans have called the rush of allegations an attempt by Democrats to smear Kavanaugh's name and drag out the process until after the midterm elections, when the Democrats could have a majority and be in a position to block Trump's nominee.

[Read: Kavanaugh advances in 51-49 Senate vote with help from Flake, Collins, Manchin]

The survey was conducted among 1,500 likely U.S. voters nationwide and had a 2.5 percentage point margin of error.