A bipartisan group of senators is warning the Trump administration against returning U.S.-based diplomatic compounds to Russia that were seized in response to Moscow’s election meddling.

The letter followed a Washington Post report last week that the administration is considering returning the diplomatic properties — one on Long Island and another on Maryland’s Eastern Shore — to Russia.

“Returning the compounds to Russian control is unjustifiable,” the senators, including Republican Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (S.C.), wrote to President Trump on Wednesday.

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“It would both make it easier for the Kremlin to continue its intelligence operations in our own backyard and make it clear that they can avoid consequences for their actions. We strongly advise against it,” they added.

The letter was also signed by Sens. Amy Klobouchar (D-Minn.), Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) and Chris Van Hollen (D-Md.).

In late December, then-President Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE shuttered the compounds on the grounds that they were being used for “intelligence-related purposes.”

The decision, along with the expulsion of several Russian diplomats from the U.S. and new sanctions on Moscow, was in response to Russian interference in the presidential election — which Russia has denied.

“These properties were seized because 17 U.S. intelligence agencies confirmed that Russia used covert cyberattacks, espionage, and harmful propaganda to try and undermine our democracy, in addition to the fact that U.S. diplomats in Russia faced repeated harassment from Russian security services,” the senators wrote.

“We need to stand strong and stand united so that Russia and other nations know that this aggression will not go unchecked,” they added.

The return of the compounds was initially explored as a potential exchange for the Russians lifting a hold on construction of a U.S. consulate in St. Petersburg, according to the Post.

In response to the report, a senior communications adviser for the State Department told NBC, “The U.S. and Russia have reached no agreements. The next meeting will be in June in St. Petersburg.”

A State Department aide offered no details of the timing of the meeting when contacted by The Hill.

Secretary of State Rex Tillerson has said that Russian election interference is “fairly well-established” and has noted the low point in U.S.-Russia relations over the conflict in Syria.

Still, Wednesday’s letter points to fears in Washington about the prospect of the Trump administration easing penalties on Russia levied in response to the election interference.

The FBI is currently probing any links or coordination between Trump campaign associates and Moscow, as part of its broader investigation into Russia’s actions.