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Photo: Scott Olson/Getty Images

The Republican-led Senate Intelligence Committee has subpoenaed Donald Trump Jr. to answer questions about his previous testimony before Senate investigators in relation to the Russia investigation, sources with direct knowledge told Axios.

Why it matters: It's the first congressional subpoena — that we know about — of one of President Trump's children. The subpoena sets up a fight that's unprecedented in the Trump era: A Republican committee chair pit against the Republican president's eldest son.

  • It's also a sign that the Russia investigations in Congress aren't over despite the conclusion of special counsel Robert Mueller's probe and despite Senate Majority Leader Mitch McConnell saying it's time to move on from the Russia probe.
  • A Senate Intelligence Committee spokesperson told Axios: "We do not discuss the details of witness engagements with the Committee. Throughout the investigation, the Committee has reserved the right to recall witnesses for additional testimony as needed, as every witness and witness counsel has been made aware."
  • "Don and Senate Intel agreed from the very beginning that he would appear once to testify before the committee and would remain for as long as it took to answer all of their questions. He did that. We're not sure why we're fighting with Republicans," a source close to Trump Jr. told Axios.

Between the lines: Mueller, whose investigation did not find a conspiracy between the Trump campaign and Russia, did not indict Trump Jr., despite speculation that he would.

  • Unlike many congressional investigations in the Trump era, the Senate Intelligence probe — led by Republican chairman Richard Burr and Democratic vice chair Mark Warner — has been largely bipartisan.
  • The fact that they're subpoenaing Trump Jr. is a strong signal that he declined a request to appear before the committee again.

The backstory: Trump Jr. testified before the Senate Judiciary Committee in September 2017 that he was only "peripherally aware" of proposed plans for the Moscow project. His testimony was released. He testified for a total of more than 25 hours with three different committees, per a source familiar with the situation.

  • In an interview with Fox News’ Laura Ingraham in January 2019, Trump Jr. downplayed his knowledge of the discussions about a possible Trump Tower in Moscow, saying that the project was a creation of President Trump's former attorney Michael Cohen: "We don't know anything about it. Ultimately, it was Michael Cohen essentially trying to get a deal done."

What we know: Cohen claimed in his testimony before the House Oversight Committee in February that Trump Jr. was more aware of the project than that. During the 2016 presidential campaign, Cohen testified, he briefed Trump Jr. and Ivanka Trump about the proposed Trump Tower Moscow project about 10 times.

Worth noting: Cohen pleaded guilty in November to lying to Congress. He reported to prison on Monday to serve out his three-year prison sentence.

Go deeper ... Timeline: Here's what we know about Trump Tower Moscow

Go deeper

Updated 3 hours ago - Energy & Environment

Thousands without power as "hazardous" winter storm lashes East Coast

Satellite imagery of the Northeastern U.S. taken by NOAA on Jan. 17. Photo: NOAA

A major winter storm lashed much of the East Coast Sunday and Monday, causing widespread power outages and disrupting travel over the holiday weekend.

The latest: Authorities in North Carolina confirmed that two people died in a car crash and that they responded 600 vehicle accidents during the storm on Sunday, per the Washington Post.

Texas abortion law remains in effect after appeals court ruling

Pro- and anti-abortion protesters outside the Supreme Court as arguments begin about the Texas abortion law on Capitol Hill in November. Photo: Jabin Botsford/The Washington Post via Getty Images

A U.S. appeals court transferred a challenge to Texas' law banning most abortions after about six weeks of pregnancy to the state supreme court in a 2-1 vote on Monday evening.

Why it matters: The 5th U.S. Circuit Court of Appeals' decision means the country's most restrictive abortion law can remain in place for the time being.

5 hours ago - World

At least 2 dead after Tonga volcano eruption and tsunami

A satellite image of the explosive eruption of the Hunga Tonga-Hunga Ha'apai volcano on Saturday. Photo: UNICEF/NOAA

At least two people are confirmed to have died in Tonga following the undersea volcanic eruption that sent tsunami waves toward the island nation and across the Pacific over the weekend, officials said Monday.

The big picture: Officials reported major damage along the western coast of the main island of Tongatapu, where the capital, Nuku'alofa, was covered in ash and dust, including on the runway of the airport. A New Zealand Ministry of Foreign Affairs spokesperson told Axios over the phone that two people had been confirmed to have died in the disaster.