Third of US voters in three key Midwest states believe Trump should be re-elected in 2020

Poll coincided with US President's controversial summit with Vladimir Putin, where he made comments indicating he doubted US intelligence community

Donald Trump surprised many political commentators by winning Michigan and Wisconsin in the 2016 US presidential election (REUTERS/Jonathan Ernst)

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 re-elected in 2020, according to new NBC News/Marist polls.

The poll indicated that 28 per cent of registered voters in Michigan, a state Mr Trump flipped from his Democrat rivals in the 2016 presidential election, said he deserved a second term. Some 62 per cent of voters polled believe it's time to replace Mr Trump, the poll found.

In Minnesota, a state Mr Trump lost to Hillary Clinton by fewer than two percentage points in 2016, roughly 30 per cent of voters surveyed said the US leader deserved another go-around in the Oval Office, while 60 per cent said he does not.

Thirty-one per cent of voters in Wisconsin are in favour of a second term for Mr Trump, while 63 per cent saod they are not, the NBC/Marist polls show. Mr 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 four percentage points.

Other questions in the survey indicated Mr Trump may be struggling to maintain his appeal to voters in the Midwest. In Michigan, 36 per cent approved of his job performance while 54 per cent thought otherwise.

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

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

During a joint press conference at the summit last week, Mr 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 Mr Putin's denial instead.

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

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