White House chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE said Sunday that it "could be a while" before lawmakers have a list of military construction projects impacted by President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's emergency declaration to move funding to a wall along the southern border.

Mulvaney, who also heads the Office of Management and Budget, said he's not aware of any existing list that describes projects that will have funding reallocated to the border wall.

"I know of no list and if anybody should know it should be me," he said on "Face the Nation" on CBS. "There’s no list of projects that are absolutely not going to be funded so that the wall can be."

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Mulvaney said that no programs that had money appropriated through September of this year will be affected. Instead, the list in question would consist of programs that are set to be funded beyond the end of this fiscal year, which would allow Congress time to backfill the funding.

"I know of the universe of things that might be delayed, or reduced, or cut in a very extreme circumstance that could be used to fund the wall," he said. "But a list of a decision that's already been made, saying this money's going to be cut and spent over there, that’s not been made yet.”

.@MickMulvaneyOMB claims no programs scheduled to start in 2019 will be impacted by emergency declaration, adding: “there's no list of projects that are absolutely going to not be funded...” He added that they fully expect the veto override to fail in the House. pic.twitter.com/vu28I8MXYX — Face The Nation (@FaceTheNation) March 17, 2019

In declaring a national emergency last month, the president said he planned to redirect $3.6 billion in military construction funding toward the border wall project. He also said he would take separate executive action to repurpose about $2.5 billion from the Defense Department’s drug-interdiction program and $600 million from the Treasury Department’s asset-forfeiture fund.

Senators have expressed frustration over the lack of information regarding which specific military construction projects could be affected, with a handful of Senate Democrats writing to acting Secretary of Defense Patrick Shanahan Patrick Michael ShanahanHouse Armed Services chairman expresses confidence in Esper amid aircraft carrier coronavirus crisis Boeing pleads for bailout under weight of coronavirus, 737 fallout Esper's chief of staff to depart at end of January MORE last week to demand a full list.

Shanahan sought to reassure senators at a hearing on Thursday that Trump’s use of military construction funding for a wall "will not come at the expense of our people, our readiness, or our modernization."

Trump on Friday vetoed a resolution terminating the national emergency, setting up Congress for a vote to override it.

Sen. Tim Kaine Timothy (Tim) Michael KaineButtigieg stands in as Pence for Harris's debate practice Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D-Va.) suggested in an interview broadcast Sunday on "Face the Nation" that the White House was attempting to withhold the list of relevant projects until after Congress votes on the veto as a way to keep certain lawmakers from rebuking the White House.

"This is the White House wanting to hold the list back because they worry that if senators and House members saw the potential projects that were going to be ransacked to pay for the president’s wall they would lose votes," Kaine said.

Sen. @timkaine: White House is withholding information on military projects being cut because they fear losing votes if Congress saw what would “be ransacked to pay for the president's wall.” pic.twitter.com/IZSblBLCt6 — Face The Nation (@FaceTheNation) March 17, 2019

Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) has set a vote in the House to override the president's veto for March 26.

Mulvaney said Sunday that he's certain Congress lacks the votes necessary to override the veto.