WASHINGTON — The Trump administration’s rush to declare Houthi rebels in Yemen a terrorist business leaves humanitarian assist workers and professional importers vulnerable to legal penalties, officials stated Monday, jeopardizing upcoming shipments of food stuff, clinical supplies and other aid to the impoverished place.

Secretary of Condition Mike Pompeo, who introduced the terrorism designation late Sunday, explained officers were being “planning to put in spot measures” to guarantee that the help ongoing.

But that failed to guarantee a amount of lawmakers, diplomats and aid groups who accused the administration of pushing by means of the plan just before President Trump leaves place of work upcoming week, and said clear-minimize lawful protections should really have been enacted in tandem with the terrorism designation to avoid an additional barrier to helping 1 of the world’s poorest states.

The terrorism designation “makes it more durable to deliver lifesaving assistance in a place by now dealing with the worst humanitarian disaster in the environment,” mentioned Agent Gregory W. Meeks, a New York Democrat who is chairman of the Household International Affairs Committee.

“People will undergo and die, and all those fatalities are completely preventable,” Mr. Meeks explained.

The terrorism designation, which Mr. Pompeo announced late Sunday and will take impact Jan. 19, imposes new financial and vacation sanctions on Houthi rebels who overthrew the Yemeni governing administration six a long time back and have been combating a war from Saudi Arabia considering that 2015.

It mostly aims to hobble Iran, the Houthis’ key benefactor, by discouraging weapons, supplies and other assist that Tehran has been sending to the rebel motion as aspect of a Center East proxy war.

Mr. Pompeo explained the action sought “to advance attempts to attain a peaceful, sovereign and united Yemen that is each free from Iranian interference and at peace with its neighbors.”

He also mentioned problems that the designation would limit assist to desperate Yemenis, but stated if the Houthis “did not behave like a terrorist business, we would not designate it.”

That did small to guarantee aid personnel and other business importers who demanded clarification on seemingly contradictory standards of legal responsibility.

“It is challenging to envision that in the final days of the Trump administration, a bolt of lightning is likely to strike them and they are instantly going to figure how not to retain these designations from using an agonizing toll on Yemen’s civilians,” said Scott Paul, the humanitarian coverage guide for Oxfam America. “We can’t count on that occurring.”

Congressional aides voiced comparable problems following becoming briefed on Monday by officers from the State Office and the U.S. Agency for Worldwide Development.

The Houthis, who phone on their own Ansar Allah, or the Partisans of God, are the de facto governing administration in a swath of territory wherever the the vast majority of Yemen’s inhabitants life, together with the money town, Sana, and the country’s most important port.

Saudi Arabia and a range of Arab allies, which have pushed for the terrorism designation, have failed to restore the internationally acknowledged federal government as the war in Yemen has settled into a quagmire, birthing what United Nations officers have identified as the world’s worst humanitarian disaster.

Tens of millions of Yemenis depend on federal government institutions the Houthis control to get simple products. Ships bringing food need to pay out port costs at a Houthi-managed port, and Western charities support academics and health and fitness treatment personnel who get the job done for Houthi-managed administrations, irrespective of whether they assistance the group or not.

Mr. Pompeo pointed to a Dec. 30 attack on the civilian airport in the Yemeni metropolis of Aden, killing 27 individuals, as evidence of the Houthis’ capacity for terror. No just one has claimed responsibility for that attack, and both equally Al Qaeda and the Islamic Point out are both of those lively in the area.

Many analysts consider the Houthis pose no immediate threat to the United States, and have voiced skepticism that the sanctions will stress the Houthis to negotiate an conclusion to the war. The United States has supported the Saudi exertion in the war, which has killed countless numbers of civilians in Yemen.

Mohammed Ali al-Houthi, a senior member of the Houthi motion, scoffed on Monday at the designation that he stated would final result “in killing and spreading hunger.”

A spokesman for the incoming administration of President-elect Joseph R. Biden Jr. did not rule out reversing the designation soon after Mr. Trump leaves office on Jan. 20.

Even diplomats who say the Houthis do not qualify as a terrorist firm, and objected to the designation, identify that “they are certainly an odious team,” mentioned Gerald M. Feierstein, the ambassador to Yemen through the Obama administration.

“So how do you eliminate the F.T.O. designation with out suggesting that you sympathize with them or maintain them innocent for the disaster in Yemen?” claimed Mr. Feierstein, now with the Middle East Institute in Washington. “It will not be uncomplicated.”

Lara Jakes reported from Washington, and Ben Hubbard from Beirut, Lebanon. Edward Wong contributed reporting.