Florida passed Amendment 4 in 2018 which allows felons to vote in the election.
It adds another 67,000 votes to Florida, which holds 29 electoral college seats.
Trump beat Clinton in Florida in 2016 by more than 100,000 votes.
Already, more than 6million have voted in the sunshine state through early voting or mail-in ballots.
Convicted felons are voting in this year's presidential election in Florida for the first time, adding 67,000 potential votes to the election, after a 2018 law change.
Amendment 4 was passed in Florida in 2018. It allows convicted felons to vote so long as they have completed their sentences.
This year, it means that tens of thousands more will have a say in the outcome of the presidential election in a key swing state.
Florida holds 29 electoral college votes. Trump won it in 2016, but it went Democrat in the previous two elections.
There are now only three states in the country where felons cannot vote at all even after they have completed their sentences - Iowa, Kentucky, and Virginia.
Six others limit it depending on the severity or nature of the crime.
More than 6million people in Florida have already cast votes. There are 14,441,860 registered voters in the state.
In the 2016 election, Trump beat Clinton in Florida by 112,000 votes.
Voter turnout in the state is already higher than in previous years with the number of people who have voted early.
Experts are predicting that it may reach 41 percent, which will be the highest since 1992.