On Tuesday, Al Jazeera English TV host Mehdi Hasan demonstrated how journalists should fight the lies of Trump supporters.

“Most experts have said that a wall will not solve the problem of illegal drugs,” reporter Mehdi Hasan told a former DEA agent, Derek Maltz, who supports Trump’s wall.

“Your colleagues at the DEA say most illegal drugs come in through legal ports of entry,” he continued.

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“I’m not listening to the colleagues at the DEA,” Maltz shot back.

Watch: