I had to google that. I found this and it seems to be fully researched.
Specifically, the House could “direct the sergeant-at-arms to arrest the witness, try her in the House, and upon conviction, place her in detention in a House facility until she either complied with the subpoena or the term of the Congress expired, whichever came first.”74 This option has the advantage of not relying on any other branch of government, but it is one that Congress “has not employed . . . in over seventy years.” 75Moreover, because detention cannot extend beyond a particular session of Congress,76 a particularly recalcitrant witness could simply choose to remain in detention until the end of a session and thereby avoid testifying.
https://www.theusconstitution.org/wp-content/uploads/2019/01/Congressional-Oversight-Issue-Brief.pdf
They stopped doing that because a "civil suit in district court in the face of Executive Branch officials’ refusal to turn over documents or appear before a committee based on assertions of executive privilege" works better.
I doubt the democRATS are so stupid they would try to arrest the AG to force him to testify.
The American people would look at that and reelect Trump in a heartbeat.
Crazy democRATS jumping the shark again.
However, at least one individual—Hallet Kilbourn, a well-to-do real estate speculator—was remanded to the District of Columbia’s Common Jail. Kilbourn’s case provides an amusing and historically important example of an uncooperative witness.