The final verdict in President Trump’s historic Senate impeachment trial could be delayed to as late as Wednesday — after the Iowa caucuses and State of the Union address — officials said Friday, as senators were preparing to hear four hours of debate on whether the trial should include witnesses.

Democrats have been pushing to call former national security adviser John Bolton and other officials who declined to participate in the House proceedings that led to Trump’s impeachment. Sen. Mitt Romney (R-Utah) will vote to hear witnesses, an aide said Friday. But most GOP senators, led by Senate Majority Leader Mitch McConnell (R-Ky.), have rallied to the president’s defense and said he should not be removed from office.

Trump faces charges of abuse of power and obstruction of Congress. The crux of the case for his impeachment is the allegation that he withheld military aid and a White House meeting to pressure Ukraine to investigate Joe Biden and his son. Hunter Biden served on the board of Burisma, a Ukrainian energy company, while his father was vice president.

●Senate appears ready to reject witnesses in Trump impeachment trial.

●Sen. Lamar Alexander (R-Tenn.) calls Trump’s actions ‘inappropriate’ but rejects witnesses in impeachment trial

●A president ‘is not above the law,’ Trump lawyer Alan Dershowitz asserts in rebutting criticism of his impeachment defense.