Poll: Trump's reelection prospects hold steady amid impeachment inquiry

President TrumpDonald John TrumpTwitter CEO: 'Not true' that removing Trump campaign video was illegal, as president has claimed Biden formally clinches Democratic presidential nomination Barr says he didn't give 'tactical' command to clear Lafayette protesters MORE's reelection prospects remain unchanged amid the launch of a House impeachment inquiry, according to a new Monmouth University survey. 

The poll, which was conducted last week, found that 57 percent of voters polled said it was time for a new president, while 39 percent said Trump should be reelected in 2020. 

The results reflected no change from the last Monmouth University Poll survey, which was conducted in August. 

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The poll comes after Speaker Nancy PelosiNancy PelosiNRCC turns up heat on vulnerable Democrats over Omar's call to abolish police Shocking job numbers raise hopes for quicker recovery Engel primary challenger hits million in donations MORE (D-Calif.) announced last week that the House would launch a formal impeachment inquiry amid allegations from a whistleblower that Trump sought to persuade Ukraine to investigate former Vice President Joe BidenJoe BidenBiden formally clinches Democratic presidential nomination The Memo: Job numbers boost Trump and challenge Biden Chris Wallace: Jobs numbers show 'the political resilience of Donald Trump' MORE, the front-runner for the Democratic presidential nomination.

Trump has since stepped up his attacks against Biden, zeroing in on the former vice president's efforts to pressure Ukraine to dismiss a senior prosecutor who at one point had investigated an energy company where Biden's son had served as a board member.

The same poll found Biden and Sen. Elizabeth WarrenElizabeth WarrenTwitter CEO: 'Not true' that removing Trump campaign video was illegal, as president has claimed Biden formally clinches Democratic presidential nomination Warren, Pressley introduce bill to make it a crime for police officers to deny medical care to people in custody MORE (D-Mass.) with the highest favorability ratings among voters. 

Biden has a 46 percent favorable rating and 45 percent unfavorable rating with voters, while Warren has a 42 percent favorable rating and 40 percent unfavorable rating. 

Sen. Bernie SandersBernie SandersBiden formally clinches Democratic presidential nomination OVERNIGHT ENERGY: Trump signs order removing environmental reviews for major projects | New Trump air rule will limit future pollution regulations, critics say | DNC climate group calls for larger federal investment on climate than Biden plan Google: Chinese and Iranian hackers targeting Biden, Trump campaigns MORE (I-Vt.) came in with the highest unfavorable ratings at 49 percent, compared to a 42 percent favorable rating. 

Warren has outpaced Sanders and front-runner Biden in some polls.

The survey from Monmouth University Poll was conducted Sept. 23-29 among 1,161 adults. The margin of error is plus or minus 3.1 percentage points.