President Trump's Truth Social demands to end the filibuster are just a hint of his coming rampage if Senate Republicans hold out against him, advisers tell Axios.

Why it matters: Most Senate Republicans have no interest in nuking the filibuster. But Trump's frustration is the first clear sign that the shutdown, which becomes a record on Wednesday, is getting to him. • "He will make their lives a living hell," one Trump adviser told Axios. • "He will call them at three o'clock in the morning. He will blow them up in their districts. He will call them un-American. He will call them old creatures of a dying institution. Believe you me, he's going to make their lives just hell," the source continued. • Another adviser emphasized: "He's really mad about this."

Zoom in: For weeks, Trump

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