Trump loses support from some Republicans
Among the voices condemning Trump for his threat against Iranian "civilization" and the ongoing US airstrikes are some of his long-time allies in the Republican party.
Georgia Congressman Austin Scott, who serves on both the House Armed Services committee and the intelligence committee, told BBC News that Trump's comments will do little to stop the fighting.
"The president's comments are counter-productive and I do not agree with them," said Scott.
Texas Republican Nathaniel Moran posted on X that he takes issue with Trump's threat.
"Our nation has always conducted military operations for just causes and through just and moral means. This must continue in the future; otherwise we forfeit our legitimacy to lead the world," Moran wrote.
"So, let me be clear: I do not support the destruction of a 'whole civilization.' That is not who we are, and it is not consistent with the principles that have long guided America."
Trump has also faced criticism from notable conservative voices in the media, including Tucker Carlson, Alex Jones, Candace Owens and Joe Rogan.
Former Congresswoman Marjorie Taylor Greene, who split with Trump after building her political career as a Trump loyalist, called his latest threat "insane" and called for him to be removed from office.
"We cannot kill an entire civilization," she wrote on X. “This is evil and madness.”
Joe Kent, the former director of the National Counterterrorism Center who quit over Trump decision to attack Iran, says Trump risks America's reputation if he decides to target civilian infrastructure.
"Trump believes he is threatening Iran with destruction, but it is America that now stands in danger," he posted on X.
"If he attempts to eradicate Iranian civilization, the United States will no longer be viewed as a stabilizing force in the world, but as an agent of chaos—effectively ending our status as the world’s greatest superpower."