Trump and his vice presidential nominee Mike Pence toured flood-ravaged areas and met with local Republican leaders and emergency officials.
US President Barack Obama meanwhile announced he is headed to Louisiana on Tuesday, after days of criticism from some in the southern state for not visiting.
Officials said about 40,000 homes were impacted by inundating waters and more than 86,000 people had so far registered for federal aid -- with that number expected to grow.
During one stop, Trump reportedly criticized Obama for remaining on vacation during the disaster, including playing golf on Wednesday.
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"The president says he doesn't want to come, he is trying to get out of a golf game," Trump said, according to ABC News.
However the White House said that Obama is being "mindful of the impact that his travel has on first responders and wants to ensure that his presence does not interfere with ongoing recovery efforts."
"I will tell you he was very gracious and a good listener," Wiley said.
As the catastrophe unfolded over the past seven days, many local and state officials lamented the lack of national media coverage which would help bring more donations for victims.
The first financial analysis of the disaster released Friday by the Baton Rouge Area Chamber, an economic development group, suggested that the flood impact may be greater than first thought.
During Trump's visit, Democratic presidential candidate Hillary Clinton put out a statement saying she had spoken with Louisiana Governor John Bel Edwards and urged people to donate to the relief effort.
"Right now, the relief effort can't afford any distractions," Clinton said. "The very best way this team can help is to make sure Louisianans have the resources they need.
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