Transcript for Trump goes after General McChrystal as 'a dog'

President trump used one of his first tweets of the of the year to attack retired four star general Stanley McChrystal. After McChrystal called him dishonest and immoral the president said McChrystal got fired like a dog by Obama. Adding that he was known for his quote. Big dumb mouth McChrystal was commander of US troops in Afghanistan but he resigned in 2010 after he criticized Vice President Biden and other Obama officials.

This transcript has been automatically generated and may not be 100% accurate.