Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) said Wednesday that while he supports additional barriers at the U.S.-Mexico border, he believes some of the estimated costs for President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s border wall are too high to justify.

"I remain a fiscal conservative, even on the wall, so I’m not excited about spending $20, $30, $40 billion on a wall. I’m still a believer that we don’t have money to spend. We’re $700 billion in the hole,” Paul said on CNN.

“And while I will vote for money for barriers, I’m not voting for $40 billion for barriers,” Paul added.

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A report last week detailed Trump’s plan to ask Congress for $18 billion to fund a wall along the border. A wall was among his signature campaign promises.

The Trump administration is seeking $33 billion in total to increase southern border security, with the remaining $15 billion going to fund technology, personnel and other improvements.

Another $8.5 billion over seven years would be used to pay for 5,000 new Border Patrol agents.

Paul said Wednesday he supports having barriers in certain locations along the border, but that the price tag of those barriers should be debated. He also advocated for using technology to improve border security, which he argued is a cheaper alternative.

"The barriers, I think we need to look at the cost of them. The people advocating for it are forgetting they’re fiscally conservative and are just giving enormous numbers,” Paul added.

Lawmakers met Tuesday to discuss immigration, including border security and the future of the Deferred Action for Childhood Arrivals (DACA) program.

Trump has said funding for the border wall is a requirement for his agreement on a legislative fix for DACA, which allows certain immigrants brought to the U.S. illegally as children to live and work in the country without fear of deportation.