While U.S. elections are facing potential interference from Russia, China is posing more threats to the United States than any other country, according to FBI Director Christopher Wray.

During testimony before the Senate Judiciary Committee on Tuesday, July 23, Wray said the Federal Bureau of Investigation has more than 1,000 investigations involving economic espionage and attempted intellectual property theft, and nearly all lead back to China.

But as the 2020 presidential race is taking place, the FBI chief said Russia is determined to influence the U.S. election systems though the Trump administration has imposed sanctions and made other measures to deter Moscow.

“The Russians are absolutely intent on trying to interfere with our elections,” through a foreign campaign, Reuters citing Wray said.

At the hearing, the committee chairman Lindsey Graham, a Republican senator from South Carolina, questioned: “if everything the United States has done is not enough to deter Russia, and all the sanctions, all the talk, they’re still at it?”

“Yes. My view is until they stop they haven’t been deterred enough,” Wray answered.

However, Wray said it was China that poses a more serious counterintelligence threat than any other country, including Russia.

Wray testified one day before former special counsel Robert Mueller was scheduled to appear before Congress to answer questions about his Russia probe. Republicans are expected to have tough questions for Mueller. Sen. Graham, one of President Donald Trump’s closest allies, has vowed to investigate the origins of the probe.

Includes reporting from AP, Reuters.