President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE faces a steep uphill climb to a second term, even if it’s far too early to count him out.

Trump campaign aides have talked up the president’s chances of doing even better than he did in 2016. They note the economy is strong and that he has scored some of the highest poll ratings of his tenure since the release of special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s report.

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But the headwinds for Trump are severe.

One of the largest: His polarizing approach looks to be more hindrance than help.

In four separate polls over the past month, more than 50 percent of respondents said they would not vote for him again or were unlikely to do so. The percentage who said they would vote for him never rose higher than 38.

The most recent of those polls, from Fox News, found 54 percent of respondents saying they would probably not or definitely not vote for Trump.

In a Quinnipiac University Poll, 52 percent of respondents said they would definitely not vote for the president, while 33 percent said they definitely would. Only 13 percent were in the middle ground, saying they would “consider” backing Trump.

It will be hard to overcome negative perceptions of the president that look to have become fixed. Some of the voters who backed Trump as an anti-establishment disruptor in 2016 appear to have peeled away.

Trump’s overall approval ratings remain mediocre at best. In the RealClearPolitics polling average Monday afternoon, Trump’s job performance gained the approval of 43 percent of voters and the disapproval of 53.6 percent.

But Trump’s salvation could lie in the idiosyncrasies of the Electoral College.

Trump lost the popular vote to Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE by 2.1 percentage points in 2016, even as he triumphed in the Electoral College 306-232.

Trump’s 2020 campaign manager, Brad Parscale Bradley (Brad) James ParscaleMORE, has insisted that the president could win states that eluded him last time around.

During an appearance on CBS News’s “Face the Nation” last month, Parscale asserted that Colorado, Minnesota, New Hampshire, New Mexico and Nevada — all of which backed Clinton — could go for Trump in 2020.

“In every single metric, we’re looking at being bigger, better and badder than we were in 2016,” Parscale insisted.

Even if that turns out to be the case, the most likely pathway to victory for Trump has familiar contours.

He emerged victorious in 2016 largely because he won Florida — the biggest of the traditional swing states — and demolished the so-called blue wall.

The term refers to three large states — Pennsylvania, Michigan and Wisconsin — that had not backed a Republican for president since the 1980s.

Pennsylvania is the largest of the three, bestowing 20 electoral votes on the victor.

Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE, the early Democratic front-runner, officially launched his campaign in Philadelphia on Saturday. Trump was in Montoursville, Pa., for a campaign-style rally on Monday evening.

Terry Madonna, a professor of public affairs at Pennsylvania’s Franklin & Marshall College, said he would not rule out Trump winning the state again — but there were significant barriers.

“Trump’s job performance [rating] here is lower than in the national polls. But he also has a constituency that remains firm — the working-class voters in the northeast and southwest parts of my state, in the old mining and mill towns,” Madonna said.

“The real problem Republicans have is that the suburbs outside Philadelphia have gone from solidly Republican 30 years ago to trending Democratic,” Madonna added.

There is plenty of evidence of trouble for Trump.

A Quinnipiac University Poll released last week indicated Biden would beat Trump by 11 points in Pennsylvania.

The same poll also showed other Democratic candidates vanquishing the president, though by smaller margins: Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) ran ahead of Trump by 7 points, and Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) did so by 3 points.

Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) was in a dead heat with Trump, while South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE (D) held a statistically insignificant 1-point advantage.

Those kinds of findings add to Biden’s appeal as the candidate purportedly best able to rebuild the blue wall.

Some argue his appeal could be broader.

Steve Schale, a Democratic strategist in Florida who was the 2008 state director for former President Obama’s campaign, is backing Biden in the primary but has no formal role with his campaign.

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Schale said that Florida was always going to be a “jump ball” given the state’s competitive makeup.

But he added that the swing voters in the Sunshine State “tend to look like the swing voters in the Upper Midwest and Pennsylvania. Maybe they have moved here from that part of the country. So generally, the same types of candidates are going to do well in Florida.”

Trump and his campaign pretty clearly see Biden as the biggest threat. The president took another swipe at Biden on Twitter on Monday.

Trump called Biden “Sleepy Joe” three times in one tweet.

But it’s Trump himself who needs to be fully awake to the difficulties he faces in 2020.

The Memo is a reported column by Niall Stanage, primarily focused on Donald Trump’s presidency.