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Media tycoon Jimmy Lai at the Next Digital offices in Hong Kong in June. Photo: Anthony Wallace/AFP via Getty Images

National Security Adviser Robert O'Brien said in a statement Monday night the Trump administration is "deeply troubled" by the arrest of Hong Kong pro-democracy activist Jimmy Lai on suspicion of "collusion with foreign powers."

Why it matters: The arrest Monday of the most prominent person under the new national security law that gives Beijing more powers over the former British colony comes amid heightened tensions between the U.S. and China.

Details: Lai has been bailed, per the BBC. The 72-year-old's son was also arrested, Lai's pro-democracy newspaper the Apple Daily reports

  • Mark Simon, an executive at the tycoon's media firm Next Digital, tweeted that police had gone to Lai's home after issuing search warrants before heading to Apple Daily's newsroom to conduct a search.
  • Hong Kong police said in a statement Monday they searched a building in Tseung Kwan O, where Apple Daily's headquarters are located. They said they had arrested seven people on suspicion of breaching the national security law.
  • "Offences include collusion with a foreign country/external elements to endanger national security," the police added.

What they're saying: "These reported arrests, following the recent action by the Hong Kong government to unjustly disqualify candidates and postpone the Legislative Council elections, are the latest violations of Beijing’s commitments to the Hong Kong people and the world," O'Brien said.

"These arrests are also a clear effort to intimidate pro-democracy and political opposition figures and suppress Hong Kong’s free and independent media, which have played  key roles in the city’s character and success."
— Excerpt from O'Brien's statement

Of note: Lai was among a group of activists arrested earlier this year on charges of holding illegal assemblies in August and October related to the massive pro-democracy protests that swept the Asian financial hub last year.

  • When the national security law was imposed by Chinese lawmakers in June, Lai told the BBC in response that it "spells the death knell for Hong Kong."

Go deeper: With new security law, China outlaws global activism

Editor's note: This article has been updated with new details throughout.

Go deeper

Trump bans Americans from investing in 31 companies with links to Chinese military

Photo: Kevin Frayer via Getty

President Trump signed an executive order Thursday prohibiting American companies and individuals from owning shares in any of the 31 Chinese companies previously listed as enabling the People’s Liberation Army, effective Jan. 11.

Why it matters: Many of these companies trade on U.S. exchanges and are sometimes purchased by American investors as part of mutual funds. It’s unclear what effect Trump’s latest sanctions could have on the markets.

New York AG alleges "significant evidence" of Trump Organization fraud

Combination images of former President Trump and New York State Attorney General Letitia James. Photo: Al Drago/Bloomberg via Getty Images; Scott Heins/Getty Images

New York's attorney general filed a motion Tuesday seeking to compel former President Trump and his two elder children to appear for sworn testimony in her office's civil investigation into the Trump Organization's financial dealings.

Why it matters: Attorney General Letitia James revealed new details in the court filing and a statement on her office's investigation into the Trump Organization's business practices, including a preliminary finding alleging the company used "fraudulent and misleading asset valuations to obtain economic benefits."

2 hours ago - Technology

Ex-N.Y. Post digital chief files lawsuit alleging sexual harassment

Richard B. Levine) (Photo by Richard Levine/Corbis via Getty Images

Former New York Post editor Michelle Gotthelf is suing her former employer, its parent company News Corp. and two editors, alleging she was reprimanded after complaining to senior executives that she was sexually harassed by retired N.Y. Post editor-in-chief Col Allan. The N.Y. Post issued a statement denying any wrongdoing.

Why it matters: "I felt that I owed it to myself and I owed it to the news organization and the people who answered to me," Gotthelf, who was a long time editor at the N.Y. Post, told Axios in an interview.