Actually, no he can't, as he didn't violate the chain of command. When you have an issue with someone in your chain of command that is above you, you are to go to the next person in that chain of command (not those below him). Since Trump is the end of the road as far as chain of comman, going to Congress is the appropriate course of action.
Calls to court-martial Lt. Col. Vindman: 'The law isn't optional just because an officer hates his commander in chief'Former Trump adviser Christian Whiton says Alexander Vindman should be court-martialed for testifying against the president & breaching chain of command.www.bizpacreview.com
If Trump really wanted to pursue a court martial he could. He gave Vindman the easy way out after admitting he did not follow his chain of command under oath. This scumbag got off easy but Repubs aren't going to rock the boat when they have the wind at their backs. They are thinking long gain over short.
So once again, you are believing lies.