Senators unveiled a resolution on Thursday to block President TrumpDonald TrumpFormer New York state Senate candidate charged in riot Trump called acting attorney general almost daily to push election voter fraud claim: report GOP senator clashes with radio caller who wants identity of cop who shot Babbitt MORE's emergency declaration to construct the U.S.-Mexico border wall.

Sens. Tom UdallTom UdallOvernight Defense: Milley reportedly warned Trump against Iran strikes | Pulitzer Prize-winning photographer killed in Afghanistan | 70 percent of active-duty military at least partially vaccinated Biden nominates former Sen. Tom Udall as New Zealand ambassador Senate Democrats befuddled by Joe Manchin MORE (D-N.M.) and Susan CollinsSusan Margaret CollinsThe 17 Republicans who voted to advance the Senate infrastructure bill Senate votes to take up infrastructure deal Gyms, hotels, bus companies make last-ditch plea for aid MORE (R-Maine) introduced the resolution on the Senate floor, where it's expected to be taken up within a matter of weeks.

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The two senators, in back-to-back speeches, stressed that the Senate's vote wasn't about whether a senator supported the U.S.-Mexico border wall or Trump but about maintaining a separation of power between the executive and legislative branches on funding the government.

“I support, strongly support, protecting the institutional prerogatives of the United States Senate and the system of checks and balances that is central to the structure of our government,” Collins said. 

Udall added that the debate over the emergency declaration was about the “strength of the rule of law.”

"This is about protecting the very heart of our American system of government. ... Congress and only Congress holds the power of the purse,” he said.

The Senate resolution, which is also being co-sponsored by Sens. Lisa MurkowskiLisa Ann MurkowskiThe 17 Republicans who voted to advance the Senate infrastructure bill Senate votes to take up infrastructure deal The Hill's 12:30 Report - Presented by Facebook - Officers give grueling, horrific accounts of Jan. 6 MORE (R-Alaska) and Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenEquilibrium/ Sustainability — Presented by NextEra Energy — Clean power repurposes dirty power CIA watchdog to review handling of 'Havana syndrome' cases Frustration builds as infrastructure talks drag MORE (D-N.H.), comes two days after the House passed its measure to block Trump’s emergency declaration.

All Democrats are expected to back the resolution once it comes to the Senate floor. They’ll need four Republican senators to get it to Trump’s desk, where he’s said he will veto it.

So far, three Republican senators have said they will vote for the resolution: Collins, Murkowski and Thom TillisThomas (Thom) Roland TillisThe 17 Republicans who voted to advance the Senate infrastructure bill Senate votes to take up infrastructure deal GOP, Democrats battle over masks in House, Senate MORE (N.C.).

Several other Republicans have voiced concerns about Trump’s emergency declaration.