Senate Majority Leader John Thune (R-SD) defended President Donald Trump‘s “historic” decision to strike Iran’s three nuclear sites.

The United States struck the Fordow fuel enrichment plant, as well as the Natanz and Isfahan nuclear facilities, on Saturday. Trump confirmed that the three sites were “totally obliterated” by six 30,000-pound bunker-buster bombs and 30 Tomahawk cruise missiles. Despite allegations from Democratic lawmakers that Trump violated the Constitution by ordering the strike without consulting Congress, Thune argued the president was “perfectly within his authority” while on Fox News’s America’s Newsroom on Tuesday.

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“I think that what happened over if weekend is one of the reasons American people voted for President Trump. It is peace through strength. What he did was historic. It should be viewed through that lens. The Democrats will complain loudly, but they are flat on the wrong side of history on this issue,” Thune said.

Thune, 64, was a senior in high school when the Iranian Revolution broke out in 1979, and then Shah Mohammad Reza Pahlavi was overthrown by the Islamic Republic of Iran. Thune implied that then-President Jimmy Carter’s actions to support the coup d’état were “disastrous” and a stark difference from Trump’s actions.

“The Democrat arguments to the contrary … is Trump derangement syndrome on full display. Pure and simple. Nothing more, nothing less, or nothing else. That’s what they’re gonna do, they’re gonna scream,” Thune said. “But the fact of the matter is legally, constitutionally, and obviously from a historic and moral side of this argument, the president was on solid ground and the American people know that, which is why I believe a majority of Americans, including a lot of Democrats, support what the president did.”

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Trump brokered a ceasefire deal between Iran and Israel, which first launched strikes at Iranian nuclear sites in Tehran over a week ago. Monday night, Israel briefly violated the ceasefire, which promised Iran would also violate the agreement, but the two have agreed to stop. Trump admitted he was “not happy with Israel” over the matter.

Reps. Alexandria Ocasio-Cortez (D-NY) and Sean Casten (D-IL) have proposed impeaching Trump over the strikes.