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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 5 mins ago - Science

Volcanic eruption in Tonga caused "significant" damage

This satellite image of the eruption on Jan. 15 taken by Himawari-8, a Japanese weather satellite operated by Japan Meteorological Agency and released by National Institute of Information and Communications Technology (NICT). Photo: NICT via AP

Significant damage has been reported in Tonga following an undersea volcanic eruption on Saturday, which covered the Pacific nation in ash and cut off communication lines.

Driving the news: The eruption triggered tsunami warnings across Tonga's islands and in other regions, including the West Coast of the U.S. and New Zealand.

Updated 1 hour ago - Politics & Policy

Trump dogs "dull" DeSantis ahead of potential 2024 matchup

Photo illustration: Sarah Grillo/Axios. Photo: Paul Hennessy/SOPA Images/LightRocket via Getty Images

Donald Trump is trashing Ron DeSantis in private as an ingrate with a "dull personality" and no realistic chance of beating him in a potential 2024 showdown, according to sources who've recently talked to the former president about the Florida governor.

Why it matters: The two are among the most popular Republicans in the country, and as the former president eyes another run in 2024, he's irked by DeSantis' popularity and refusal to rule out running against him.

Updated 1 hour ago - Politics & Policy

Omicron dashboard

Illustration: Brendan Lynch/Axios

  1. Health: Concerns grow over CDC's isolation guidelines — Experts warn of more COVID-19 variants after Omicron — WHO recommends 2 new treatments — What "mild" really means when it comes to Omicron.
  2. Vaccines: America's vaccination drive runs out of gas— Puerto Rico expands booster shot requirements— Supreme Court blocks Biden's vaccine mandate for large employers.
  3. Politics: Vivek Murthy calls SCOTUS vaccine mandate block "a setback for public health" — Focus group says Biden weak on COVID response, strong on democracy.
  4. Economy: America's labor shortage is bigger than the pandemic— — CDC COVID guidance for cruise ships to be optional starting Saturday — The cost of testing.
  5. States: America struggles to keep schools open — Youngkin ends mandates for masks in schools and COVID vaccinations for state workers.
  6. World: Beijing reports first local Omicron case weeks before Winter Olympics — Teachers in France stage mass walkout over COVID protocols.
  7. Variant tracker