White House senior policy adviser Stephen Miller tried mightily to bulldoze Chris Wallace of Fox News Sunday as the host sharply fact-checked him on President Donald Trump’s reasons for declaring a national emergency so he can build his border wall.

Wallace began by challenging Miller with a quote Friday from Trump, who conceded: “I didn’t need to do this. But I’d rather [build the wall] much faster.”

Wallace turned to Miller: “How does that justify a national emergency?”

Miller cited a “crisis” at the border with an “increasing number of people crossing the border.”

“Let’s look at the facts,” Wallace responded.

He pointed to statistics highlighted on a screen that illegal border crossings were less than 25 percent of figures from 19 years ago. He also noted that nearly 90 percent of illegal drugs coming across the border enter via ports of entry, where walls don’t — and won’t — exist.

Miller responded that no one, including the administration, knows who is dodging detection. “You don’t know what you don’t know,” he said.