public Step withExpression(Expression expression) {
        setExpression(expression);
        return this;
    }
<p>
A tagged union to specify expression for a routing step.
</p>

@param expression
       A tagged union to specify expression for a routing step.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-connect/src/main/java/com/amazonaws/services/connect/model/Step.java