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 (R-Neb.) on Sunday night said he does not think 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 should dignify Russian President Vladimir Putin with a meeting, given Putin's past relationship with the U.S.

Sasse, who is an outspoken critic of Russia and occasionally Trump, took to Twitter with his take on who Putin is and what he wants.

Things Every American Should Know Before the Trump-Putin Helsinki meeting:



1. Exactly who is Vladmir Putin, the Russian leader our president is about to meet with in Helsinki? And what does he want?



It’s a complicated question. But here’s what we do know… — Ben Sasse (@BenSasse) July 15, 2018

"I don't think President Trump should be dignifying Putin with this meeting," Sasse tweeted.

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Trump is scheduled to meet with Putin in Helsinki on Monday. The summit will come 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 for conspiring to influence the 2016 presidential election.

"President Trump should have only one message for Putin tomorrow: Quit messing with America," he added.

Sasse hit Putin for his history as a member of the KGB, the security agency for the Soviet Union, and his authoritarian rule in Russia.

"Putin is a murderer," Sasse tweeted. "He has ordered the assassinations of political adversaries and used outlawed chemical weapons to do it."

Sasse also called Putin a "crook and a liar" for breaking agreements with the U.S. on Syria and Ukraine, and an "enemy of America" for attacking the U.S. "regularly."

"Remember, Putin ordered the influence operations that have been exposed in the most recent indictments, did not hesitate to invade Ukraine and Georgia, organized a coup in Montenegro, funded xenophobic political parties across Europe, and crippled Estonia with cyberattacks," Sasse tweeted.

Sasse also said "Putin is not America's friend, and he is not the President's buddy."

Trump has said he has "low expectations" for his meeting with Putin, and has been ambiguous as to whether he will confront Putin over Russian interference in the 2016 presidential election.

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