Activist investor Carl Icahn slammed Cigna's (CIG - Get Report) move to acquire Express Scripts. TheStreet's founder and Action Alerts PLUS Portfolio Manager Jim Cramer finds Icahn's criticisms "quizzical."

"I want that deal to close," Cramer said.

Icahn said Amazon (AMZN - Get Report) poses a threat to Express Scripts (ESRX) . 

Cramer's charitable trust owns shares of Cigna rival UnitedHealth (UNH - Get Report) .

Cigna shares are down 6.6% since the start of the year.