Top betting sites on Monday showed President Donald Trump and former Vice President Joe Biden with even odds of winning the presidential election in November.

British betting website Oddschecker shows Trump and Biden both at +110, with Sanders a longshot at +4,000. However, OddsShark shows Biden as the slight favorite to win in November, with -105 odds, compared to Trump's even odds, while Sanders is less of a longshot at +3,300.

The odds will see a change once a Democratic candidate is nominated. With Sanders and Biden still fighting for delegates, oddsmakers eventually will shift the Democratic nominee's odds, as they face a one-on-one challenge with Trump. Several states have yet to vote in their primary and Sanders could continue his campaign until the convention. Also, the odds could shift on the Democratic nominee's running mate choice.

Should Biden win the nomination, his odds could greatly improve if both Democrats and independents rally around his candidacy. Biden has attempted to court progressives, adopting parts of Massachusetts Sen. Elizabeth Warren’s bankruptcy plan and Sanders’ college affordability proposal.

The ongoing coronavirus outbreak could dramatically affect Trump’s odds for winning the election. Trump has long boasted about the economy as the top reason for a second term but the coronavirus could be the catalyst for a long recession.

Trump’s handling of the crisis could also impact his reelection odds, with some criticizing the lack of tests for the virus and his initial denial about the severity of the pandemic. A poll released Tuesday by NPR, PBS Newshour and Marist College shows 60% of Americans have little to no trust in the information they are hearing from Trump amid the outbreak.

“Odds are a prediction and a reflection of perceptions of outcomes. Trump's chance of winning the U.S. presidential election has recently drifted in a way like it has not before, which is likely as a result of the handling of the coronavirus outbreak,” said U.S. Bookies betting analyst Alex Donohue.

If the coronavirus outbreak begins to subside, the U.S. economy could bounce back, which would likely boost Trump’s reelection odds.

According to Johns Hopkins University, there are at least 5,068 cases of coronavirus in the United States. The domestic death toll has reached 85.