Four Republican senators have signed a letter urging President Joe Biden to send missile systems to Ukraine as that embattled Eastern European nation struggles to defend itself against a Russian invasion.

“I wrote to President Biden with my colleagues and urged him to provide Ukraine with the missiles its military needs to win. Not doing so will only prolong the war and cost lives,” Sen. Tom Cotton of Arkansas tweeted.

In the letter, Cotton and fellow GOP Sens. Lindsey Graham of South Carolina, Susan Collins of Maine, and Roger Wicker of Mississippi pressed Biden to provide Ukraine with MGM-140 Army Tactical Missile Systems.

“Additional delay will only further undermine U.S. national security interests and extend this conflict,” the letter asserts. “It is essential that the United States immediately provide ATACMS so Ukraine can achieve vital objectives before winter and deny Russia the ability to fortify its positions.”

“The U.S. is fully capable of providing these weapons without any appreciable risk to its own combat capability. Ukraine has significantly degraded Russian combat power and only requires a small portion of our stockpiled ATACMS. Further, the U.S. has the capability to produce hundreds of ATACMS and Precision Strike Missiles a year and replenish its inventory in the near term,” the lawmakers wrote. “We urge you to authorize the immediate shipment of ATACMS to Ukraine.”

In response to a post from Cotton about the letter, Republican Rep. Matt Gaetz of Florida tweeted, “How long till the Ukraine First caucus wants to send nukes?”

“When does this actually end, Senator? What are the United States’ interests and objectives here?” Jenna Ellis asked.

The U.S. has allocated billions to support Ukraine, but Biden and many lawmakers want to approve even more assistance for the war-torn country.

Graham has previously claimed that it is “imperative” for the U.S. to to keep supporting the Ukrainian military.

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