Both Hillary Clinton and Donald Trump held rallies in Ohio and Pennsylvania on Friday.
Hillary Clinton and Donald Trump are set to campaign in Florida, a key battleground state that could tip Tuesday’s US presidential election.
Florida is the largest swing state and is a must-win for Mr Trump.
The Republican candidate will later fly to North Carolina before heading west to Nevada.
Opinion polls in recent days have suggested Mr Trump is gaining support but he still remains behind Mrs Clinton in most surveys.
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In Florida, the contest appears to be tight. Real Clear Politics’ poll average puts the Democratic candidate ahead, but poll analysis website FiveThirtyEight says Mr Trump has a 52.4% chance of winning the state.
US President Barack Obama won Florida in 2012 by a margin of just 0.9% over Republican Mitt Romney.
Candidates need 270 electoral college votes to win the presidency. Florida is worth 29.
Some 37 million early voters have already cast their ballots.
Reports suggest many more Latino voters are turning out early in key states including Florida, Arizona and Nevada compared to past elections.
In recent days, Mrs Clinton has been holding rallies in states that had been considered safe for the Democrats, in response to Mr Trump’s climbing poll numbers.
After campaigning in South Florida, she will make an appearance in Philadelphia, Pennsylvania in the evening alongside pop star Katy Perry.
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