What’s causing a spike in immigration at the border?

TAMPA, Fla. - Gov. Ron DeSantis and his supporters continued to go toe-to-toe with his opponents Wednesday, days after he chartered two flights to send 50 migrants from Texas to Massachusetts.

Charlie Crist, DeSantis' Democratic opponent for governor, sounded off during a virtual news conference.

"He didn't care that Florida taxpayers and refugees fleeing socialist dictatorships would pay the price," Crist said. "This is an issue of human decency and a lack thereof by Governor DeSantis. That's a disaster, not just politically, but morally and that's the music he's facing right now."

Crist believes the governor broke the law and opened the state up to potential legal trouble, including a class action lawsuit filed this week by several migrants who were on the flights to Martha's Vineyard. They claim they were lied to about where they were going and were falsely promised jobs and places to live when they arrived.

RELATED: DeSantis says he can't confirm Florida is paying nearly $1M for more migrant flights

The governor denies and wrongdoing and said the migrants signed waivers that were written in English and Spanish, agreeing to be relocated.

Meanwhile, Florida Sen. Marco Rubio, a DeSantis ally, slammed the lawsuit.

Ron DeSantis says he's simply stopping the migrants at the source in Texas rather than trying to track them down after they've arrived in Florida.

"They didn't enter the country the proper way and they're immediately in court demanding rights and claims under our laws," Rubio said during an appearance on America's Newsroom on FOX News. "This is outrageous. What other country in the world would that even be allowed?"

A day earlier, the governor stood by his decision to charter the flights. He said he's simply stopping the migrants at the source in Texas rather than trying to track them down after they've arrived in Florida.

RELATED: Lawsuit seeks nationwide injunction to block Gov. DeSantis' migrant flights

"Everyone down there will say between a third and 40 percent of the people coming across are seeking to end up in Florida," stated DeSantis. "If you can do it at the source and divert to sanctuary jurisdictions, the chance they end up in Florida is much less... What we're doing is not the ultimate solution. I think it's opening people's eyes to the solution, which is let's have a secure border."

A record number of migrants have crossed the southern border so far this year.

According to the U.S. Customs and Border Protection, from 2016 through 2018, between 400,000 and 500,000 migrants crossed the southern border, That number rose to more than 970,000 in 2019, but dropped to less than 500,000 in 2020, when the U.S. began limiting entry due to COVID-19.

Ron DeSantis chartered two flights to send 50 migrants from Texas to Massachusetts

Last year, however, the country saw its first big spike when 1.7 million migrants entered the U.S. So far this year, more than 2.1 million have crossed into the country.

RELATED: Venezuelan migrants sue Gov. DeSantis over Martha's Vineyard flights

Steve Maggi, an immigration expert who founded the SMA Immigration Law Firm, told FOX 13 there are several reasons for the increase in migration, one of which is chaos in several Central and South American countries.

"Most of the countries there are in economic disarray. There's a lot of social unrest. There are no jobs," Maggi said, adding COVID-19 restrictions created another problem. "That created a huge bottleneck. So I think the spike in numbers that you're seeing are a result of that bottleneck of all the migrants that were coming across."

Ron DeSantis says the migrants signed waivers that were written in English and Spanish, agreeing to be relocated.

Maggi believes the most important factor is an inconsistent border policy that hasn't improved from one administration to another.

"The root problem is we don't have a clear and coherent policy in how we want to treat people trying to come here for legitimate reasons to the United States," he said. "If you look at just the past few years from the Trump administration to [the Biden administration], there's no coherence. There's no consistency in how the law is applied."

The majority of the migrants who were flown to Martha's Vineyard are Venezuelans who are escaping a violent government.