Misinformation and conspiracy theories swirling around the 2020 presidential race are reaching an "alarming" number of Latino voters in Florida through Spanish language social media sites, advocacy groups and elected officials said.

The experts voiced concern that the barrage of misleading messages about Biden and the coronavirus, often containing right-wing conspiracy theories, could swing the vote in the state, where Latinos account for 17% of registered voters, according to a Pew Research Center analysis of Florida state government data.

Advocates pointed to Republicans and Trump as some of the sources of disinformation flooding Latinos' social media feeds, but the full picture regarding the origins of the information was not immediately clear.

-ABC News' Laura Romero

Harris underwent testing for COVID-19 today and tested negative, a Harris aide said.

The Biden-Harris campaign has announced the results of the candidates' COVID-19 tests since Trump tested positive for COVID-19 earlier this month.

Harris, who turns 56 today, has a virtual rally this afternoon to kick off the first day of voting in Wisconsin.

-ABC News' Averi Harper

As early voting officially kicks off in Wisconsin, the state has already seen about four times more absentee ballots cast and five times as many ballots requested as compared with this time last year -- and the start of early in-person voting today is likely to bring in another big wave of voters.

Early voting schedules are different in every municipality, but it runs from today through Oct. 30. It's technically early absentee in-person: Voters receive an absentee ballot in their clerks' office, fill it out and hand it back to the clerks.

This morning, just before early in-person voting began, over 1.4 million ballots had been requested and 915,965 returned.

Some voters in Milwaukee queued up in long lines waiting to enter their polling sites.

-ABC News' Cheyenne Haslett

A photo is circulating on Twitter depicting a City of Miami police officer wearing a pro-Trump mask inside a polling site. The chair of the Miami-Dade Democratic Party, Steve Simeonidis, took the photo and posted it but ABC News could not confirm the officer's name.

Miami Police issued a statement referencing "the photograph being circulated," noting that "this behavior is unacceptable, a violation of departmental policy, and is being addressed immediately." A public information officer with the department, Mike Vega, told ABC News by phone that the chief of police will take "immediate action."

Vega said that donning political clothing or accessories is "a violation of our departmental orders," and Simeonidis told the Miami Herald he considered the officer's behavior "voter intimidation."

A spokeswoman for the Miami-Dade County elections office told ABC News that a complaint about the incident was brought to her attention this morning. She then passed it on to Miami Police.

-ABC News' Will McDuffie

This is now an actual attack line that Trump is deploying against former Biden.

"He wants to listen to Dr. Fauci," Trump told a crowd in Arizona Monday afternoon, the mention of Dr. Anthony Fauci's name drawing boos.

It takes head-spinning logic to cast Trump's feud with Fauci as a winning campaign message for an incumbent who is down in the polls. The campaign is continuing to air ads that feature Fauci -- out of context -- appearing to applaud the president's decisions on COVID-19, even while Trump calls him a "disaster" and his fellow health officials "idiots."

This fight, though, only makes more obvious what the campaign is about. With cases surging in battleground states and beyond, and with the president himself back on the trail from his own illness for only a week, Trump's assertion that "people are tired of COVID" is pretty clearly true -- with whatever meaning one might impose on those words.

New ABC News/Washington Post polling from North Carolina, out Tuesday morning, reinforces how much the coronavirus has cost the president credibility and political standing.

It’s Biden 49, Trump 48 in one of the president's must-win states, with Biden leading by 34 points among self-described moderates. He captures 68% support among those worried about catching the coronavirus.

One last debate and two weeks of rallies will give Trump more chances to try to change the campaign subject. For now, and once again, the campaign that could have been about so many different things remains focused on one very big thing.

-ABC News’ Political Director Rick Klein