Elizabeth Warren more "dangerous" Democrat for Trump

Peter Thiel, an early Facebook investor and Trump supporter, said the Democratic Party would assume the president by 2020.

"Elizabeth Warren scares me the most," he said Monday at Fox News' "Tucker Carlson Tonight" show.

"It's she who really talks about the economy, and that's the thing that matters most," Thiel told Carlson. He added that the others were "equally unimpressive" since they all embraced "one form of identity politics or another".

Thiel also reiterated his call to the FBI and the CIA for that they are investigating Google to determine if the AI. the search was infiltrated by Chinese espionage.

Noting that Google has called his research "Manhattan Project for A.I," he added. "I would naturally think that would attract the attention of foreign intelligence agencies."

He also said that he thought some Google employees thought ideologically that the United States was worse than China.

Thiel generally remained out of the spotlight, but emerged in 2016 to endorse Donald Trump's presidential campaign and speak at the Republican National Convention, a rare move in Silicon Valley. Last year, Thiel donated to the Republican National Committee as Trump geared up for his reelection campaign.

He also talked about Google's monopoly in the past.

Facebook, which rivals Google for billions of dollars in online advertising, is also under scrutiny for having too much power over the technology sector.

Representatives from both companies, as well as Apple and Amazon, will testify Tuesday before the Judiciary Committee of the House on antitrust issues. Facebook will also appear before House and Senate committees this week to defend its plan to facilitate a new digital currency called Libra.

WATCH: Peter Thiel makes his first six-figure donation to the mid-term campaign cycle at RNC