Democrats have been always building the border wall

Biden, 2020: There will not be another foot of wall constructed on my administration, No. 1.

2019, Pelosi: Pelosi called the wall “an immorality” and claimed it is “the least effective way to protect the border and the most costly.”
“I can’t think of any reason why anyone would think it’s a good idea — unless this has something to do with something else,” she said.

Karine Jean-Pierre: "Bigoted border wall"

AOC: “xenophobic campaign stunt … that falls down in the wind.”

Warren: Trump’s wall as “racist”

Schumer: has repeatedly referred to the border wall as “expensive” and “ineffective.”

Ilhan Omar: "racist border wall"

Kamala Harris: Trump’s wall “wasteful” and a “vanity” project

Mayorkas, 2023: Secretary Mayorkas told this Committee under oath that he supported Biden's decision to end border wall construction

October 2023: Biden to build border wall in Texas, citing 'immediate need' after 2 MILLION illegal immigrants enter US in 2023

This is what happens when "adults are in charge".

Soon everybody would known - and would have always known - that Biden tries to build the wall, but evil Trump prevented him from doing that up until 2023, when Biden finally won.