The Republican-led Senate Intelligence committee just subpoenaed Donald Trump Jr.

There's a first time for everything.

The Senate Intelligence Committee, led by Republicans, has subpoenaed Donald Trump Jr. to answer questions about his previous testimony before Senate investigators concerning Special Counsel Robert Mueller's investigation into 2016 Russian election interference, sources told Axios. It's the first known subpoena of one of President Trump's children.

Axios also notes the decision is significant because it pits a Republican committee chair against a member of a Republican president's family.

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That fact has the Trump administration a little confused.

Regardless, the decision shows that the Congressional investigation into Russian election interference is not over, despite Mueller completing his task.

Trump Jr. previously testified before the Senate Judiciary Committee in 2017, saying he was only "peripherally aware" of the Trump Organization's proposed Trump Tower project in Moscow during his father's presidential campaign. Trump's former lawyer, Michael Cohen, challenged that claim in his own testimony before the House Oversight Committee in February.