First Assistant U.S. Attorney Bill Essayli said Chinese espionage is "extremely pervasive" in the U.S. following the arrest of an alleged Chinese agent in Los Angeles this month.
Essayli told Fox News Digital in an interview that his office has pressed charges against several alleged Chinese spies in recent months, saying Beijing is brazen in their attempts to build their access inside the U.S.
"I think it's extremely pervasive," Essayli said of Chinese spying. "China is one of our biggest adversaries, and they're committed to advancing their interests. And they're playing the long game, and so they are willing to put a lot of resources into developing sources, recruiting people within the U.S. to advance their interests.
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"They're willing to steal our technology; they're willing to engage in espionage here. So, there's no limit to what China is willing to do. It is a huge, huge concern. We have to be vigilant, and we have to disrupt these operations on our soil," Essayli said. "We have to protect our sovereignty."
"If you look at just the cases we brought this year, just in my office, I mean, you had cases where the woman from Irvine was engaged in espionage against the Taiwanese president's family member. I had a guy last week, we arrested, he sold more than $300 million in SI chips, formerly known as AI chips, to China," he continued. "You had a mayor of a local city that we charged for serving as an unregistered agent of China as well, pushing out their propaganda and taking orders from China."
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"So, it's extremely pervasive. It's a huge problem, but the FBI is on it," he said. "They have entire squads dedicated to combating this, and we're committed here at the U.S. Attorney's Office to supporting those investigations and bringing criminal charges to disrupt these operations."
Wanying Zhang, 34, of Irvine, was arrested earlier this month for allegedly working with an associate to photograph and record the family outside their Seattle-area home, according to a criminal complaint obtained by Fox News Digital.
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Authorities nabbed Zhang, who goes by "Heather" in the U.S., at the Los Angeles airport as she attempted to board a plane to China.
Essayli said FBI Los Angeles agents arrested Zhang on a federal charge of acting as an unregistered agent of the People’s Republic of China.
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She allegedly traveled to Seattle in 2025 at the direction of Chinese officials and sent them photos, videos and license plate information.
"She coordinated the trip with an associate and used tradecraft to avoid detection," Essayli wrote. "She never notified the attorney general she was acting for a foreign government, a federal offense."
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Speaking on "The Big Weekend Show" Sunday, Essayli said Zhang is a naturalized U.S. citizen and confirmed the alleged surveillance targeted a relative of Taiwan’s president.
"She was conducting surveillance on behalf of the Chinese government. She was acting as a foreign agent," Essayli said. "And she was spying on a relative of the president of Taiwan here in the U.S."
The alleged target was Ting-Yu Lai, the U.S.-based son of Taiwanese President Lai Ching-te, CBS News reported, citing law enforcement sources. The complaint does not name him.
"Saw him. Young male. It’s that young one," Zhang allegedly messaged a Chinese government contact while outside the home.
"I am videorecording," she allegedly added before sending two license plate numbers.