The determination of red line placement, or for that matter existence

New York Times:

The 332-to-95 vote to table the impeachment article drafted by Representative Al Green, Democrat of Texas, constituted the first action by the House since Democrats took control in January on a measure to impeach Mr. Trump, a significant move that Speaker Nancy Pelosi of California and other party leaders have toiled to avoid. By agreeing to table the article, Ms. Pelosi and the Democrats put off — at least for now — a prolonged and divisive debate over whether Mr. Trump’s conduct warrants his expulsion.