WASHINGTON — A newly released Quinnipiac University Poll shows that that favorable feelings about the economy aren't helping President Donald Trump's approval ratings — even though the state of the economy is one of his favorite talking points. It also shows that Joe Biden has the highest favorability ratings among the Democratic field.

According to the poll, 71% of the voters say that the economy is "good" or "excellent," the highest proportion of favorable feelings on the economy in nearly 18 years of Quinnipiac's polling.

Last month's economic data showed that unemployment in the United States had fallen to 3.6%, a 50-year low. That said, 45% of voters disapproved of Trump's handling of the economy, while 48% approved.

“The nation’s economy is pretty darn good and President Donald Trump’s approval numbers are pretty darn awful,” Tim Malloy, assistant director of the Quinnipiac University Poll, said in a statement.

More:Economy added 263,000 jobs in April, unemployment falls to 3.6%, new 50-year low

These good feelings about the economy haven't helped Trump's approval ratings. They're still lower compared to presidents with similarly well-performing economies.

Only 38% of voters approve of Trump, and 57% disapprove. Going into 2020, 54% of voters say that they "definitely" will not vote to re-elect Trump.

“For the moment, the disparity leaves the president on shaky re-election ground,” Malloy continued.

As for the Democrats, the poll also found that former Vice President Joe Biden is the Democratic presidential contender with positive favorability ratings. Forty-nine percent of voters had a favorable opinion of Biden and 39% have a negative opinion of him.

New York City Mayor Bill de Blasio, who just announced his candidacy for president, suffers from low favorable and high unfavorable ratings. Only 8% of voters have a favorable opinion of de Blasio, whereas 45% have an unfavorable opinion.

The poll sampled 1,078 voters nationwide, from May 16-20, with a margin of error of 3.7 percentage points.