GOP Sen. Ben Sasse Benjamin (Ben) Eric SasseTrump says he'll sign order aimed at protecting premature babies in appeal to religious voters Government watchdog recommends creation of White House cyber director position Chamber of Commerce endorses McSally for reelection MORE (Neb.) called on President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE to declare that Russia is an enemy of the U.S. as the commander in chief met with Russian President Vladimir Putin.

Sasse made the remark in response to a Trump tweet ahead of the meeting in which he blamed the poor U.S. relationship with Russia on past U.S. administrations and the investigation into possible interference in the 2016 presidential election.

“Our relationship with Russia has NEVER been worse thanks to many years of U.S. foolishness and stupidity and now, the Rigged Witch Hunt!” Trump tweeted.

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Our relationship with Russia has NEVER been worse thanks to many years of U.S. foolishness and stupidity and now, the Rigged Witch Hunt! — Donald J. Trump (@realDonaldTrump) July 16, 2018

“A better thing, Mr. President, would be to declare: ‘Russia is the enemy of America and our allies, and we will expose and respond to their continued cyber-attacks against our nation,’ ” Sasse responded.

A better thing, Mr. President, would be to declare: "Russia is the enemy of America and our allies, and we will expose and respond to their continued cyber-attacks against our nation." https://t.co/qNvgGRA58T — Ben Sasse (@BenSasse) July 16, 2018

On Sunday, he said that he does not think Trump should be “dignifying” the Russian leader with a meeting.

"President Trump should have only one message for Putin tomorrow: Quit messing with America," Sasse tweeted. He also called Putin a “murderer” for his history as a member of the KGB, and a “crook and a liar.”

The Trump-Putin meeting in Helsinki comes days after special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s indictment of 12 Russian intelligence officials. Mueller charged the officials with conspiring to hack into U.S. systems and influence the presidential election.

Trump told reporters that he would bring up election meddling in his one-on-one meeting with Putin.

Correction: An earlier version of this story misattributed a quotation to Sasse. It has been corrected.