President Trump's proposed wall along the southern border could cost more than three times an initial estimate, according to Senate Democrats.

The U.S.-Mexico border wall could cost $66.9 billion, in addition to roughly $150 million in annual maintenance, according to a report released Tuesday by Democratic staff on the Senate Homeland Security and Governmental Affairs Committee.

The Democratic report's figure is significantly higher than an internal Department of Homeland Security report, which estimated that the wall would take between three to five years to complete and cost $21.6 billion.

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The staff report also warns that building the wall would require years of litigation to help acquire land currently owned by private individuals. Customs and Border Protection told the committee staff that it was "too early to say" how much acquiring the land would cost.

Committee staff were also told that some of the funds for border wall prototypes would be taken from a video surveillance program.

"There is no reliable estimate of the cost of construction of the full border wall,” the report states. “That amounts to a total cost to every American man, woman, and child over $200."

The Trump administration submitted a $30 billion supplemental funding bill to Congress earlier this year that includes $1.5 billion for the border wall.

GOP leadership, however, has signaled that the money could be left out of a government funding bill that needs to clear Congress by April 28.

Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) told reporters on Tuesday that Democrats want the border wall and other immigration fights held off until the fiscal year 2018 funding bill.

"[The] immigration issue should be discussed in the 2018, where there's votes," he sad.