The Senate on Friday rejected a measure to call witnesses in President Trump’s impeachment trial after Republicans argued new testimony is unnecessary, ensuring the trial will be the first in U.S. history without witnesses.

Closing arguments will begin Monday morning, under a resolution adopted by the chamber. Senators plan to vote Wednesday on the two impeachment charges against Trump for abuse of power and obstruction of Congress.

Democrats had 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. But most GOP senators, led by Senate Majority Leader Mitch McConnell (R-Ky.), rallied to the president’s defense and said he should not be removed from office.

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.

●Endangered Republicans go all-in on Trump.

●Republicans agree it was no ‘perfect call’ but will vote to acquit Trump anyway.

●Giuliani made personal ask for a former Ukrainian client during to Zelensky aide while meeting to discuss investigations sought by Trump.