President Donald Trump's poll numbers are sagging in three key Midwestern states, with only around one-third of voters saying he deserves to be reelected, according to NBC News/Marist polls out on Wednesday.

The poll coincided with Trump's controversial summit with Russian President Vladimir Putin, where he made remarks indicating he accepted Putin's denial of meddling in the 2016 US presidential election and blamed the US for poor relations with Russia.

President Donald Trump's poll numbers are sagging in three key Midwestern states, with only around one-third of voters surveyed saying he deserves to be reelected in 2020, according to new NBC News/Marist polls out Wednesday.

The poll indicated that 28% of registered voters in Michigan, a state Trump flipped in the 2016 presidential election, say he deserves a second term. Some 62% of voters polled believe it's time to replace Trump, the poll found.

In Minnesota, a state Trump lost to Hillary Clinton by fewer than two percentage points in 2016, roughly 30% of voters surveyed say Trump deserves another go-around in the Oval Office, while 60% said he doesn't.

Thirty-one percent of voters in Wisconsin are in favor of a second term for Trump, while 63% say they are not, the NBC/Marist polls show. Trump flipped Wisconsin in 2016 with around 23,000 votes.

The live-caller polls from the three states comprised of 886-906 registered voters. The margin of error was 3.8 to 4 percentage points.

Other questions in the survey indicate Trump may be struggling to maintain his appeal to voters in the Midwest. In Michigan, 36% approve of his job performance while 54% think otherwise.

Thirty-six percent of voters in Wisconsin also approved while 52% disapproved; and in Minnesota, Trump holds a 38% approval and 51% disapproval rating.

The poll, which was conducted from July 15-19, coincided with Trump's controversial summit with Russian President Vladimir Putin in Helsinki, Finland.

During a joint press conference at the summit last week, Trump made remarks indicating he doubted the US intelligence community's assessment that the Kremlin interfered with the 2016 US presidential election and appeared to accept Putin's denial instead.

Trump's comments drew swift rebukes from both Republicans and Democrats, and prompted him to walk back his remarks which he claimed he misstated.