A trio of Republican senators on Tuesday warned Senate Majority Leader Harry ReidHarry Mason ReidTrump presses GOP to change Senate rules Only thing Defense’s UFO probe proves is power of political favors Nevada Democrat accused of sexual harassment reconsiders retirement: report MORE (D-Nev.) they plan to filibuster any attempts at bringing new gun control legislation to the floor of the Senate.

The move comes just days after Reid announced plans to push forward on a gun control bill which would expand background checks and penalties on straw purchasers.

Sens. Rand PaulRandal (Rand) Howard PaulHouse poised to vote on .3T spending bill Overnight Finance: Lawmakers race to finalize omnibus | What we know about funding bill | White House on board | Fed raises rates for first time under Powell Senate passes controversial online sex trafficking bill MORE (R-Ky.), Mike LeeMichael (Mike) Shumway LeeOvernight Defense: Senate sides with Trump on military role in Yemen | Dem vets push for new war authorization on Iraq anniversary | General says time isn't 'right' for space corps Senate sides with Trump on providing Saudi military support Senate, Trump clash over Saudi Arabia MORE (R-Utah), and Ted CruzRafael (Ted) Edward CruzTrump can save Republicans and restore sanity to California in 2018 Cruz says Cambridge Analytica assured him its practices were legal Dem battling Cruz in Texas: ‘I can understand how people think this is crazy’ MORE (R-Texas) argue in a letter to Reid that the proposed bill amounts to an infringement of Second Amendment rights.

"We, the undersigned, intend to oppose any legislation that infringe on the American people's constitutional right to bear arms, or on their ability to exercise this right without being subjected to government surveillance," the senators wrote in the letter, a copy of which was obtained by Fox News.

The senators pledge in the three-paragraph letter they "will oppose the motion to proceed to any legislation that will serve as a vehicle for any additional gun restrictions."

"The Second Amendment to the Constitution protects citizens' right to self-defense. It speaks to history's lesson that government cannot be in all places at all times, and history's warning about the oppression of a government that tries," they wrote.

President Obama and congressional Democrats have been pushing for new gun controls in the wake of the Newtown, Conn. elementary school shooting late last year that left 20 schoolchildren and six educators dead. 

The White House initially proposed that lawmakers consider a renewed assault weapons ban and limits on magazine capacities as part of new gun-control measures. But Reid proceeded without those controversial provisions, acknowledging they did not have enough votes to pass the Senate. The provisions will be offered as an amendment to the legislation.

On Sunday, New York City Mayor Michael Bloomberg announced his political action committee was launching a $12-million ad campaign targeting senators in 13 key states ahead of the vote. 

The White House also said Monday that President Obama would stump in coming weeks in hopes of intensifying pressure on Congress to pass the gun control bill.