Rep. Sean Duffy (R-WI) on Monday had a difficult time defending President Donald Trump’s decision to fund his border wall by declaring a “national emergency” during a tough interview with CNN’s Alisyn Camerota.

At the start of the interview, Duffy tried to argue that a border wall was needed to stop the flow of deadly drugs from pouring into the United States, but Camerota shut him down by pointing out that the vast majority of drugs come into the country through legal ports of entry.

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“How is a national emergency to build a couple hundred miles of fence going to solve your drug problem in Wisconsin?” she asked him.

Duffy dodged the question and said that we also need funding to better inspect trucks coming through ports of entry — but Camerota once again shot him down by telling him that Congress had given funding for such measures.

Camerota then asked him how he’d feel if a future Democratic president declared a national emergency to fight climate change and then diverted billions of dollars from the Defense Department to enact a Green New Deal.

Duffy admitted that Congress probably needed to enact some “guardrails” to the president’s authority to declare a national emergency, but only after Trump had built his border wall.

Watch the video below.