The alleged ringleader of the terror attack plot on Donald Trump's UFC event is a Mexican illegal immigrant.
The suspect, Abraham Alvarez, is in custody and is understood to have overstayed his visa.
Homeland Security information reveals Alvarez came to the United States as a child and was granted deportation relief in 2014 by the Obama administration.
He failed to leave the country when his B2 visa expired in 2001.
The bomb plot targeting thousands of people at the White House event on June 14 was "stopped cold" by the FBI.
Five people were taken into custody while top officials identified 23 individuals as part of a possible network of plotters.
The alleged plan was to deploy drones carrying explosives to hit buildings close to the Washington event, which would trigger mass evacuations.
From there, the fleeing crowds would be guided towards a pre-staged sniper team, officials added.
The alleged ringleader of the terror attack plot on Donald Trump's UFC event is a Mexican illegal immigrant
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Then, the next stage of the plan allegedly involved another group storming the gate towards the White House.
Federal investigators accuse Alvarez of being responsible for planning, organising, and directing the proposed attack.
US Immigration and Customs Enforcement (ICE) lodged a detainer for Alvarez following the FBI's arrest.
The suspect was arrested by authorities on the day of the fight in Omaha, Nebraska.
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Bomb plot targeting thousands at Donald Trump's White House UFC event 'stopped cold' by FBI | GETTY
Before the plot could go ahead, America's top detectives revealed Signal chats where individuals allegedly spoke about the event.
Officials said one device revealed 23 people talking about "pre-operational activity", with some believed to be planning to travel to Virginia on June 12 or June 13.
The aim was to target "capitalist elites and billionaires", as well as politicians who had donations from the American Israel Public Affairs Committee, one suspected admitted.
After clamping down on the alleged scheme, FBI Director Kash Patel heaped praise on the bureau, the Department of Justice and law enforcement partners for their fast response.
Donald Trump was present at the event
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Mr Patel told Fox News: "Thanks to the rapid action of this FBI, our partners, and the Department of Justice in a multi-state operation, multiple individuals are now in custody and allegedly planned attacks were stopped cold.
"While the result represented the best of investigative work, it was also nothing out of the ordinary for this law enforcement team," he added.
"We are built to detect, respond to, and bring to justice those who threaten the lives of American citizens - particularly during large gatherings like the historic UFC 250 fight. That’s exactly what we did here.
"I want to thank our great agents and partners, this work remains ongoing, and we will continue to update the public as permitted."
UFC Freedom 250 took place on Sunday on the South Lawn of the White House
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UFC Freedom 250 took place on Sunday on the South Lawn of the White House to commemorate the 250th anniversary of American independence and was lauded as the "greatest show on Earth" by President Trump.
Marco Rubio said the fight would be watched by a "billion people all over the world", with the US Secretary of State describing the event as a "gift to the American people".
He added: "The White House is the people's house. It belongs to the people of the United States. The American 250 celebration belongs to the people of the United States."
The Sunday event, which saw a signature octagon cage built on the South Lawn, attracted around 4,300 attendees and 1,200 service members on duty.