Britons who voted themselves out the European Union are already expressing buyer's remorse.

It may have been U.K. Prime Minister David Cameron's announced resignation, or the cataclysmic market crash that plummeted the British pound to a 31-year low on Friday, but the gravitas of alienating trade partners has citizens worried about a looming recession.

A Daily Mail poll released Sunday found at least one million people regret voting Leave. A Survation poll had 1.1 million of 17.4 million ticking "Leave" on their ballot, many who though it was nothing more than a protests vote or at the very least inconsequential in Remain victory.

Their change of heart is about more than financial insecurities. Brexiters feel betrayed. A Twitter search of the #Brexit hashtag repeatedly follows words like "lied," "betrayed," and "regret." An online petition calling for a second referendum has already surpassed 3.8 million signatures, well above the 100,000 needed for parliamentary consideration.

Frustration rests with the UK Independence Party and vociferous leader Nigel Farage's euphoric talking points, even if some were debunked early on.

Farage unveiled UKIP's manifesto last year by saying immigrants are not the problem, "it's our current immigration system that is the problem." He warned of the dangers "10 former Communist countries" pose through an open-door policy. What Mexicans and Central Americans are to the United States, Polish immigrants are to Britain.

Farage suggested implementing an insurance-based health care system, and creating 6,000 new government jobs, mainly in law enforcement and border security sectors. Most of all, he argued for self-government without political involvement from the E.U.

If any of this sounds familiar to Americans, it may be because presumptive Republican presidential candidate Donald Trump campaigns on similar promises.

Campaigning as Outsiders

Trump and Farage each pandered to the blue-collar worker. Despite their affluence - Trump inherited his wealth; Farage earned millions as a stockbroker - the outspoken men appealed to hardline conservatives fearful of immigration and government overreach.

They aimed for disillusioned voting blocs, like baby boomers and uneducated voters, wary of progressive ideas that promote multiculturalism.

As the BBC notes, voters age 45 and over overwhelmingly voted for Brexit. Young voters were more likely to vote "Remain," but few turned out. A majority of university graduates also wanted to stay.

Each of these groups wanted an outsider, not a seasoned politician. Someone without lobbyists and donors in their ear. In Farage and Trump, it's exactly what they got, for better or worse.

Stoking Fear through Xenophobia

Trump announced his candidacy by demonizing all Mexicans are rapists and criminals. Where other presidential contenders would back down, Trump doubled-down.

The real estate magnate warned undocumented immigrants were coming and taking American jobs. He proposed strengthening the border wall at Mexico's expense without outlining a credible strategy other than to consider it a quid pro quo for "gangs, drug traffickers and cartels (that) have freely exploited our open borders."

In the UK, Polish and Middle Eastern immigrants are the political targets. Farage frequently spoke about the need to cap incoming foreigners, saying they put a strain on jobs, emergency rooms, and primary schools.

"What we are saying is this: we want an end to uncontrolled mass immigration, and end to unskilled labour coming into Britain in mass quantities," Farage said.

Overt xenophobia is the reason Trump outlasted 11 other GOP presidential candidates. It's one of the prime reasons Brexit passed.

Backtracking on Promises

Hours after the U.K. learned of their impending departure, Farage admitted one of UKIP's campaign promises was a lie.

"Leave" leaders argued that the National Health Service could save £350 million a week by seceding. Farage, who said he never directly made the claim, said UKIP "made a mistake in doing that."

"We have a £10 billion a year, £34 million a day in featherbed that is going to be free money that we can spend on the NHS, on schools, or whatever it is," Farage told ITV'S "Good Morning Britain."

Slogans like "We send the E.U. £350 million a week, let's fund our NHS instead," emblazoned buses across Britain. It was printed in Vote Leave campaign material, yet Farage said he never supported it.

Trump was in Scotland during the Brexit vote, which he strongly supported.

Aside from saying "people want to take their country back" - Scotland primarily voted to stay, and is in talks to stay in the E.U. - Trump backpedaled on an anti-immigration policy banning all Muslims from the U.S.

This, on top of publicized flip-flops on gun control, abortions, and the Iraq War.

Trump told the New York Times it "wouldn't bother" him if Muslims from Scotland entered the U.S. His national finance chairman, Steven Mnuchin, later clarified Trump's position is "about terrorism and not about religion."

Later in the day, Trump said mass deportations would not be part of his policy. The three-point immigration plan outlined on his campaign website includes a section entitled "Mandatory return of all criminal aliens," referring to anyone who is in the country illegally.

Last February, Fox News asked Trump if his immigration views are flexible. "Everything is negotiable," Trump replied.