The White House on Tuesday formally threatened to veto a resolution making its way through Congress that would terminate 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 secure funding for a wall along the southern border.

The administration said in a statement that it “strongly opposes” the resolution of disapproval and argued that Trump is justified and authorized in declaring an emergency at the border.

"The problem of large-scale unlawful migration through the Southern Border is enduring, and, despite the Administration’s use of existing statutory authorities, in recent years the situation has worsened in certain respects," it said.

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The resolution of disapproval, the administration added, would undermine its "ability to respond effectively to the ongoing crisis at the Southern Border."

The House is expected to pass the resolution with overwhelming Democratic support late Tuesday. A few Republicans have said they will also vote to terminate Trump's emergency declaration, citing concerns it oversteps on executive authority.

The resolution will then move to the Senate, where three Republicans have already said they plan to vote for it and a handful of others are undecided.

Democrats have largely expressed confidence the measure will pass through Congress, but are less certain they will have the two-thirds majority in each chamber to override a presidential veto.

White House senior adviser Stephen Miller indicated earlier this month that Trump would likely veto the resolution if it made it to his desk.

It would be the first veto of Trump's presidency.

The president earlier this month declared a national emergency to spend roughly $8 billion on barriers along the southern border after Congress approved legislation that dedicated $1.375 billion to the project.

The president's declaration highlighted $3.6 billion in military construction funding toward the border wall. Those funds would be paired with separate executive actions repurposing about $2.5 billion from the Defense Department’s drug-interdiction program and $600 million from the Treasury Department’s asset-forfeiture fund.

If Congress does not block Trump's declaration, the measure would still face legal challenges. A number of groups and states have already filed lawsuits challenging the legality of the president's declaration.