President TrumpDonald John TrumpWhere do we go from here? Conservation can show the way Gov. Ron DeSantis more popular in Florida than Trump Sotomayor accuses Supreme Court of bias in favor of Trump administration MORE’s approval rating dipped by 4 percentage points to start March, according to a new poll, dropping below 40 percent. 

The Gallup poll released Thursday showed Trump with a 39 percent approval rating, down from 43 percent in the second half of February. Trump closed the month with an unsuccessful summit with North Korean leader Kim Jong UnKim Jong UnWe should listen to John Bolton Donald Trump: Unrepentant, on the attack and still playing the victim Trump's 'two steps forward, one step backward' strategy with China MORE and saw his former personal attorney Michael CohenMichael Dean CohenFree Roger Stone Trump calls the Russia investigation 'bulls---' CNN's Axelrod says impeachment didn't come up until 80 minutes into focus group MORE deliver explosive testimony before House lawmakers. March also opened with a less-than-stellar jobs report.

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Trump's approval rating is buoyed in large part by Republicans, 90 percent of whom gave him positive marks in the Gallup poll. Thirty-three percent of independents approve of Trump, as do just 4 percent of Democrats, according to the poll.

The poll surveyed 1,039 people from March 1 to 10 and has a margin of error of 4 percentage points.

Trump's approval rating has consistently hovered around 40 percent for much of his presidency. A RealClearPolitics average of approval rating polls shows him with a 43 percent approval rating.

The new Gallup poll was released amid a week in which Trump is set to face two rebukes from the Senate. 

Senators on Wednesday passed a joint resolution calling for an end to U.S. support of the Saudi-led military campaign in Yemen. On Thursday, the Senate is expected to pass a resolution to block the president's national emergency declaration at the southern border.

Trump has indicated he will veto both measures.

In addition, Trump's former campaign chairman, Paul ManafortPaul John ManafortFree Roger Stone Trump tweets test Attorney General Barr Maxine Waters blasts Trump as 'mafia boss' over Stone case MORE, was sentenced last week to just under four years in prison for his conviction on various financial crimes. His total sentence was increased to 7 1/2 years on Wednesday after an appearance in Washington, D.C., court on separate charges. Manafort on Wednesday was also charged with fraud by Manhattan prosecutors.