Conditional: “…if he makes a wrong statement.”
You can say either "shout" or "will shout", both are acceptable.
I think the difference is that "the members of the opposition shout at him if he makes a wrong statement" implies that the minister regularly makes incorrect statements and gets shouted at.
"The members of the opposition will shout at him if he makes a wrong statement" suggests that he hasn't yet made a wrong statement, but the opposition members are prepared to shout at him if he does.