Sen. Lindsey Graham ripped into House Democrats for threatening to withhold articles of impeachment if the Senate does not agree to their rules for a trial.

“My concern is the precedent we are setting,” the South Carolina Republican said Thursday on Twitter. “The Constitution never envisioned the House being able to: Impeach the president. Dictate the terms of the trial in the Senate. And hold the Articles of Impeachment back to be released at a time of their choosing. It creates a constitutional extortion mechanism that is dangerous for the country.”