Sen. Elizabeth Warren (D-Massachusetts) is three points ahead of former Vice President Joe Biden in a new poll released Monday, just one day before the fourth Democratic 2020 presidential debate.

According to the Quinnipiac University survey, Warren — whose campaign has been gaining ground in recent weeks — boasts 30% support among likely voters, while Biden has 27% backing. The top two Democratic 2020 presidential candidates — who have both seen a 1% surge in support over the last week — will face off in Tuesday night’s debate in Ohio.

The new poll also put Sen. Bernie Sanders (I-Vermont) — who recently said he will scale back the pace of his campaign due to a heart attack — in third place with 11% support. South Bend, Indiana Mayor Pete Buttigieg and Sen. Kamala Harris (D-California) rounded out the top five candidates in this survey, with 8 and 4% support respectively.

The Quinnipiac survey also shows nearly half of respondents said Biden is the most likely Democratic candidate to defeat Trump in 2020. In total, 48% of those surveyed said the former vice president has the highest chance of winning the election, while 21% of voters said Warren is the most likely to beat Trump. However, it’s important to note that in August, only 12% of likely voters said they believed the progressive Massachusetts Senator could win the 2020 election. The poll also revealed a majority of black voters are confident Biden can win the election, while only 14 percent of African-Americans said Warrren could beat Trump in 2020.

The Quinnipiac poll also asked respondents for their opinions on a potential Trump impeachment, as well as their stance on the president enlisting of foreign countries for political or personal gain and general approval of his performance. The survey was conducted Oct. 11-13 among more than 1,100 registered voters and holds a margin of error of 3.5 percent.