The fight over witness testimony at Trump’s impeachment trial

As early as Friday the U.S. Senate is expected to vote on whether or not witness testimony will be allowed at Donald Trump’s impeachment trial. It could be a real game changer, especially in light of former national security adviser John Bolton’s new bombshell accusations against the president. Today on Front Burner, longtime CBC Washington correspondent Keith Boag explains the likelihood of testimony being heard and how it could possibly affect the outcome of the trial.