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Affirming the consequent
From RationalWiki
Affirming the consequent is a logical fallacy often used in the context of trying to establish guilt by association. It is named after the consequent in a conditional statement (Q in "if P, then Q").
Contents 
Forms of the argument
Propositional logic
 If P, then Q.
 Q.
 Therefore, P.
In formal terms, the fallacious argument is stated as .
Firstorder logic
 If P is true of x, then Q is true of x.
 Q is true of x.
 Therefore, P is true of x.
In formal terms, the fallacious argument is stated as .
Examples of the argument
Propositional form
 If it is sunny today, then I will go swimming.
 I will go swimming.
 Therefore, it is sunny today.
Firstorder form
 Fascists support a strong military.
 John Q. Warhawk supports a strong military.
 Therefore, John Q. Warhawk is a fascist.