House Democrats are slated to introduce a privileged resolution as soon as Friday in an effort to stop 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 national emergency declaration to build a barrier along the southern border, according to a Democratic aide.

Congressional Hispanic Caucus Chairman Joaquin Castro Joaquin CastroHispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-Texas) is leading the efforts on the measure, which was first reported by The Associated Press. The resolution has reportedly garnered the support of 90 Democratic co-sponsors. It's less likely to see movement in the Republican-controlled Senate.

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.) is backing the Castro resolution and urging colleagues to support it.

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Trump declared a national emergency on Friday to reallocate billions of dollars to fund construction of a barrier at the U.S.-Mexico border. Lawmakers provided $1.375 billion in funding for border fencing as part of the massive spending bill passed by Congress last week.

The move to declare a national emergency for additional border funding was met with strong pushback from Democrats as well as some Republicans, who argued it was a power grab by the president after he failed to secure the money in negotiations with congressional leaders.

Sixteen states have joined a lawsuit filed this week against the emergency declaration.

-Updated 8:30 p.m.