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The offices of China Innovation Investment Limited are seen in an office building in Hong Kong, Saturday, Nov. 23, 2019. Australia’s Treasurer on Saturday labeled detailed accusations of China infiltrating and disrupting democratic systems in Australia, Hong Kong and Taiwan as “very disturbing." A Chinese defector revealed he was part of the Hong Kong-based investment firm, which was a front for the Chinese government to conduct political and economic espionage in Hong Kong, including infiltrating universities and directing bashings and cyber attacks against dissidents. (AP Photo/Ng Han Guan)

Imaad Zuberi, left, leaves the federal courthouse with his attorney Thomas O'Brien, right, in Los Angeles, on Friday, Nov. 22, 2019. Zuberi pleaded guilty to funneling donations from foreigners to U.S. political campaigns. (AP Photo/Brian Melley)

From left, Democratic presidential candidates Sen. Elizabeth Warren, D-Mass., former Vice President Joe Biden and Sen. Bernie Sanders, I-Vt., participate in a Democratic presidential primary debate, Wednesday, Nov. 20, 2019, in Atlanta. (AP Photo/John Bazemore)

Democratic presidential candidate former Massachusetts Gov. Deval Patrick files to have his name listed on the New Hampshire primary ballot, Thursday, Nov. 14, 2019, in Concord, N.H. (AP Photo/Charles Krupa)

FILE - In this Feb. 8, 2018 file photo, the logo for Twitter is displayed above a trading post on the floor of the New York Stock Exchange. In a policy published Friday, Nov. 15, 2019 Twitter said it is banning ads that contain references to political content, including appeals for votes, solicitations of financial support and advocacy for or against political content. The ban also includes any ads by candidates, political parties, elected or appointed government officials. (AP Photo/Richard Drew, File)

Democratic presidential candidate former Massachusetts Gov. Deval Patrick campaigns Thursday, Nov. 14, 2019, at The Bridge Cafe in Manchester, N.H. (AP Photo/Charles Krupa)

FILE - In this May 7, 2017 file photo, former Massachusetts Gov. Deval Patrick arrives at the John F. Kennedy Presidential Library and Museum in Boston for the 2017 Profile in Courage award ceremony. Former Massachusetts Gov. Deval Patrick is telling allies he plans to seek the Democratic presidential nomination. That’s according to a person with knowledge of his plans who spoke to The Associated Press on condition of anonymity to discuss private conversations. (AP Photo/Steven Senne, File)

Top U.S. diplomat in Ukraine William Taylor, right, and career Foreign Service officer George Kent, left are sworn in to testify before the House Intelligence Committee on Capitol Hill in Washington, Wednesday, Nov. 13, 2019, during the first public impeachment hearing of President Donald Trump's efforts to tie U.S. aid for Ukraine to investigations of his political opponents. (AP Photo/Alex Brandon)

In this Nov. 6, 2019, photo, Democratic presidential candidate Sen. Michael Bennet, D-Colo., stands in the New Hampshire secretary of state's office in Concord, N.H., after filing to be on the state's first-in-the-nation presidential primary ballot. The bottom tier of the Democratic presidential field is soldiering on. About a half-dozen candidates are still polling around 1% and not making the debates. But they’re staying in the race because they think the primary is still very unsettled. (AP Photo/Holly Ramer)