Biden Administration Waives Laws to Allow Expansion of Border Wall - The New York Times

"The money was appropriated for the border wall. I tried to get them to reappropriate, to redirect that money. They didn't. They wouldn't," he told reporters, apparently referring to Congress. 

Asked whether he thought the border wall was effective, he replied, "no."

In January 2021, on Mr. Biden's first day in office, the administration revoked the disaster declaration and halted construction. In a proclamation, he said that, "Building a massive wall that spans the entire southern border is not a serious policy solution."…

https://www.nytimes.com/2023/10/05/us/biden-border-wall-waiver.html