President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE on Monday called Florida gubernatorial candidate Andrew Gillum (D) a "thief" as he trumpeted support for Republican Ron DeSantis Ron DeSantisOvernight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Florida to lift all COVID-19 restrictions on restaurants, bars MORE (R).

"In Florida there is a choice between a Harvard/Yale educated man named @RonDeSantisFL who has been a great Congressman and will be a great Governor - and a Dem who is a thief and who is Mayor of poorly run Tallahassee, said to be one of the most corrupt cities in the Country!"

In Florida there is a choice between a Harvard/Yale educated man named @RonDeSantisFL who has been a great Congressman and will be a great Governor - and a Dem who is a thief and who is Mayor of poorly run Tallahassee, said to be one of the most corrupt cities in the Country! — Donald J. Trump (@realDonaldTrump) October 29, 2018

Gillum, who is black, has not been convicted of any crime, though the FBI is investigating suspected corruption in his administration. He has come under scrutiny after records showed he accepted a ticket to the musical "Hamilton" from an undercover FBI agent who he believed was a local developer.

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Race has played a prominent role in the Florida gubernatorial race that has grown more heated in the final stretch leading up to Election Day.

DeSantis sparked controversy just a day after he and Gillum won their respective primaries when he urged voters not to "monkey this up" by voting for Gillum, who would be the state's first African-American governor, and his policies in the November election.

Critics suggested the remarks had racial undertones or were outright racist, but DeSantis denied that was the case.

Gillum has also been the subject of two racist robocalls which feature a minstrel-style voice. The second robocall, which came out last week, refers to Gillum as a "negro." DeSantis's campaign was not affiliated with either call and has condemned both attacks.

The Florida governor's race has emerged as one of the most closely watched races of this campaign cycle.

A RealClearPolitics average of polls in the race shows Gillum leading DeSantis by 3.2 percentage points.

Trump has fiercely backed DeSantis and is scheduled to return to Florida on Wednesday to hold another rally for the candidate.

Gillum has earned support from Sen. Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.) and other prominent progressive Democrats. Former President Obama will campaign for Gillum later this week.