War.

Executive Order 12333–United States intelligence activities
Source: The provisions of Executive Order 12333 of Dec. 4, 1981, appear at 46 FR 59941, 3 CFR, 1981 Comp., p. 200, unless otherwise noted.
[….]
2.11 Prohibition on Assassination. No person employed by or acting on behalf of the United States Government shall engage in, or conspire to engage in, assassination.
2.12 Indirect Participation. No agency of the Intelligence Community shall participate in or request any person to undertake activities forbidden by this Order.
[….]

From the Pentagon:

Immediate Release
Statement by the Department of Defense
Jan. 2, 2020

At the direction of the President, the U.S. military has taken decisive defensive action to protect U.S. personnel abroad by killing Qasem Soleimani, the head of the Islamic Revolutionary Guard Corps-Quds Force, a U.S.-designated Foreign Terrorist Organization.

General Soleimani was actively developing plans to attack American diplomats and service members in Iraq and throughout the region. General Soleimani and his Quds Force were responsible for the deaths of hundreds of American and coalition service members and the wounding of thousands more. He had orchestrated attacks on coalition bases in Iraq over the last several months – including the attack on December 27th – culminating in the death and wounding of additional American and Iraqi personnel. General Soleimani also approved the attacks on the U.S. Embassy in Baghdad that took place this week.

This strike was aimed at deterring future Iranian attack plans. The United States will continue to take all necessary action to protect our people and our interests wherever they are around the world.

From Speaker Nancy Pelosi (D):

Pelosi Statement on Airstrike in Iraq Against High-Level Iranian Military Officials
January 2, 2020

Washington, D.C. – Speaker Nancy Pelosi issued this statement after the Trump Administration conducted a deadly airstrike targeting Iranians and Iraqis at the Baghdad International Airport:

“American leaders’ highest priority is to protect American lives and interests. But we cannot put the lives of American servicemembers, diplomats and others further at risk by engaging in provocative and disproportionate actions. Tonight’s airstrike risks provoking further dangerous escalation of violence. America – and the world – cannot afford to have tensions escalate to the point of no return.

“The Administration has conducted tonight’s strikes in Iraq targeting high-level Iranian military officials and killing Iranian Quds Force Commander Qasem Soleimani without an Authorization for Use of Military Force (AUMF) against Iran. Further, this action was taken without the consultation of the Congress.

“The full Congress must be immediately briefed on this serious situation and on the next steps under consideration by the Administration, including the significant escalation of the deployment of additional troops to the region.”

“…Further, this action was taken without the consultation of the Congress…”

Oh, shit.

skullsinthestars @drskyskull
Not satisfied with “Trump’s Benghazi,” Donald quickly moved on to “Trump’s assassination of Archduke Ferdinand.”
10:07 PM · Jan 2, 2020

Jennifer Hayden @Scout_Finch
I hope those Trump kids are the first to enlist.
10:13 PM · Jan 2, 2020

Bree Newsome Bass @BreeNewsome
The mayor of NYC is tweeting about taking extra security measures but the WH has no prepared statement? That’s how you know it’s a total shit show behind the scenes. We don’t know what the strategy or plan is here and they probably don’t either.
11:09 PM · Jan 2, 2020

Oh, shit.

War.