WASHINGTON — A bipartisan group of U.S. senators is pushing the Biden administration to transfer advanced MQ-1C Gray Eagle drones that can carry Hellfire missiles to Ukraine.

Sixteen Senate Republicans and Democrats — many of whom sit on the Armed Services Committee — sent a letter to Defense Secretary Lloyd Austin on Tuesday, objecting to “press reporting“ that the Pentagon has opted not to send the drones to Kyiv and pressing him for more information.

“This particular [Unmanned Aerial System] will increase Ukraine’s unmanned capabilities in the near-term and demands careful reconsideration,” the group, led by Sens. Joni Ernst, R-Iowa., and Joe Manchin, D-W.V., wrote. “Most importantly, armed [Unmanned Aerial Systems] could find and attack Russian warships in the Black Sea, breaking its coercive blockade and alleviate dual pressures on the Ukrainian economy and global food prices.”

Sen. James Inhofe of Oklahoma, the top Republican on the committee, also signed onto the letter.

The MQ-1C Gray Eagles, made by General Atomics, can hold up to four Hellfire Missiles and have a 29,000 foot service ceiling.

Pentagon officials have been mulling Ukraine’s request for the system since at least April, but it’s hung up over concerns about securing the technology as well as its survivability in the contested airspace above Ukraine. The Defense Department has been reviewing a potential transfer for months, and a bipartisan group of 17 House lawmakers pushed Austin to expedite that review in a September letter.

The Wall Street Journal reported this month that the Defense Department decided not to transfer the Gray Eagle drones due to concerns that their ability to strike Russian territory could prompt Moscow to escalate tensions with NATO.

The Pentagon maintains that it has not yet reached a final decision.

“We have to examine what impact it would have on us, and specifically the Army,” Pentagon spokeswoman Sabrina Singh said at a briefing on Tuesday. “But nothing has been ruled out.”