BREAKING: A majority of House lawmakers have said they plan to support at least one article of impeachment against President Trump. No Republicans have said they will break ranks in the full House vote, which is expected Wednesday.

This story will update.

President Trump on Tuesday sent an extraordinary letter to House Speaker Nancy Pelosi (D-Calif.) expressing his “strongest and most powerful protest” against impeachment, which he described as a partisan “crusade” by Democrats.

Trump also told reporters in the Oval Office that he takes “zero” responsibility for the fact that he is about to be impeached.

Trump’s letter and comments came as the House Rules Committee was meeting to set the parameters for the historic debate expected Wednesday over whether the president’s conduct toward Ukraine violated his oath of office.

Earlier Tuesday, Senate Majority Leader Mitch McConnell (R-Ky.) rejected calls from Senate Minority Leader Charles E. Schumer (D-N.Y.) to subpoena new witnesses in a Senate trial, calling it “a strange request at this juncture.”

At the heart of the Democrats’ case is the allegation that Trump tried to leverage a White House meeting and military aid, sought by Ukraine to combat Russian military aggression, to pressure Ukrainian President Volodymyr Zelensky to launch an investigation of former vice president Joe Biden and his son Hunter Biden, as well as a probe of an unfounded theory that Kyiv conspired with Democrats to interfere in the 2016 presidential election.

●Senate leaders battle over impeachment trial after McConnell rejects Democrats’ calls for witnesses.

●Americans locked in partisan stalemate on removing Trump from office, Post-ABC poll finds.

●Russian disinformation network said to have helped spread smear of U.S. ambassador to Ukraine.