President Trump’s approval rating inched up from last month to the highest of his presidency, but American voters give him low marks for his handling of Russia and the immigration crisis at the southern border, a poll released Sunday shows.

His overall job approval rating climbed one percentage point from June to 45 points among registered voters, but 52 percent disapprove of the job he’s doing, according to an NBC News/Wall Street Journal survey.

Trump’s approval rating among his Republican base hit 88 percent, a mark only former President George W. Bush surpassed after the Sept. 11 attacks when he had a rating of 96 percent during the same time period, the poll showed.

Among Democrats, only 9 percent approve, while 89 percent disapprove.

But 51 percent of voters disapprove of how Trump is handling relations with Russia, compared to 26 percent who approve. And 58 percent don’t like how he’s dealing with immigration, while 31 percent give him a thumbs up.

On the economy, Trump gets a 50 percent approval rating. Thirty-four percent disapprove.

Asked about special counsel Robert Mueller’s Russia investigation, 46 percent say it should continue and 38 percent think it should end — numbers essentially unchanged from last month.

But 65 percent of voters think Moscow interfered in the election, a 12 percentage-point increase from last year.

The poll was conducted over a four-day period beginning July 15, a day before his joint news conference in Helsinki where he sided with Vladimir Putin over the US intelligence community on Russian meddling in the election, and may not provide a full picture of voter sentiment, the survey’s authors cautioned.

It polled 900 registered voters and has a plus-minus 3.27 percentage-point margin of error.