As with any equity spread strategy, there is assignment risk with short options positions. (cnbc.com)
Short option positions in American Style Options can be combined with long option positions or covering positions in the underlying deliverable to offset the high risk exposure. (home.saxo)
Note: To trade out of a spread position, it is recommended to first close the short leg before closing the long leg to avoid the high margin charge of the naked short option position. (home.saxo)