It takes guts to call out Trump the way Corker has on Twitter. Reince Preibus was a backstabbing coward who leaked information to the press. Paul Ryan and Mitch McConnell absorb insults from Trump all the time and do nothing.
Corker is correct in his Twitter rebuts but Trump marches to his drummer to appease his Twitter base. 
My concern is how Trump will react the next time he's called out for his impetuous behavior. Clearly Trump has an issues with verified facts. Eventually the lies will bury him. Hopefully. Soon.