Sen. Joni Ernst Joni Kay ErnstThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Romney backs pre-election Supreme Court vote, paving way for McConnell, Trump MORE (R-Iowa) on Sunday urged 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 be "careful" in his reported plans to pardon a number of military servicemen who were accused of war crimes.

Ernst told CNN’s Dana Bash Dana BashTrump says officials will investigate whether California is using 1619 Project in classrooms Veterans Affairs secretary defends Trump: 'I judge a man by his actions' GOP senator dismisses national intelligence director election security briefings: 'This is blown way out of proportion' MORE on “State of the Union” that she doesn’t “know the details” of the prosecution for Navy SEAL Edward Gallagher or others but urged the president to “be very careful” in making a determination on pardons.

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"I’ll just be upfront and say I don’t know the details of what went through the prosecution in that particular case," she said. "But I would say if our soldiers, sailors, airmen, marines, if they are accused and found guilty of war crimes, we need to be very careful in that because It is not OK to perpetrate war crimes."

Sen. Joni Ernst on pardons for soldiers charged with war crimes: “It is not okay to perpetuate war crimes … I would just advise the President to be very careful” #CNNSOTU pic.twitter.com/QUAGWdYGaA — CNN Politics (@CNNPolitics) May 26, 2019

The New York Times reported last week that Trump is seeking to pardon Gallagher, who was charged with a number of war crimes, including stabbing and murdering a wounded person and firing at unarmed civilians in Iraq.

The president is also reportedly looking at the case of a group of Marines who were charged with urinating on a dead Taliban member.

Ernst, a member of the Senate Armed Services Committee, said Sunday that service members need to "understand" that "we operate under a code of ethics" and said Trump should be "very careful" in determining whether to issue pardons.

"I would just advise the president to be very careful, scrutinize each case individually, and if it’s warranted, grant a pardon," she said. "If it is not, and someone has committed a war crime, then a sentence should be served."