Department of Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE unveiled a border wall project completed under President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE's push Friday, saying "walls work."

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"Walls work, it’s not my opinion," Nielsen said at the ceremony. "It’s not a tag line. It's not a political statement. It’s a fact."

The 30-foot, 2 1/2 mile long wall was built over eight months in Calexico, California.

"Looking at this, I would not attempt to climb it," Nielsen said.

"This is the wall system we are requesting Congress to fund," she later added.

During the question and answer period, Nielsen was asked about political roadblocks to constructing the wall.

"We have made the request to Congress," she said. "Whatever Congress does we are prepared to continue to focus on those areas ... But we do need the wall so we continue to ask Congress for additional funds."

DHS Secretary Nielsen views the first completed section of President @realdonaldTrump's 30-foot border wall in the El Centro Sector and holds a press conference. https://t.co/2oN7lEHeIE — Fox News (@FoxNews) October 26, 2018

In March, Trump hailed the project in Calexico as "the start" of his proposed border wall.