President Donald Trump on Tuesday vetoed a resolution from Congress directing him to end US support for the Saudi-led war in Yemen, the second such move of his presidency.

The resolution was a harsh bipartisan rebuke to Trump that took the historic step of curtailing a president’s war-making powers -- a step he condemned in a statement announcing his veto.

“This resolution is an unnecessary, dangerous attempt to weaken my constitutional authorities, endangering the lives of American citizens and brave service members, both today and in the future,” Trump said.

The veto was the second of his presidency, after he overrode a congressional resolution that aimed to reverse the border emergency he declared in order to secure more funding for his wall between the United States and Mexico in March.

Vetoing the measure is an “effective green light for the war strategy that has created the world’s worst humanitarian crisis to continue,” said International Rescue Committee president and CEO David Miliband.

“Yemen is at a breaking point with 10 million people on the brink of famine. There are as many as 100 civilian casualties per week, and Yemenis are more likely to be killed at home than in any other structure.” Trump argued that US support for the bloody war between the Saudi-backed Yemeni government and Iran-aligned Huthi rebels was necessary for a variety of reasons, “first and foremost” to “protect the safety of the more than 80,000 Americans who reside in certain coalition countries.” These countries “have been subject to Huthi attacks from Yemen,” he said, referring to drone and missile strikes the Saudi-led coalition has either claimed were intercepted or denied altogether.

The president also said the resolution would “harm the foreign policy of the United States” and “harm our bilateral relationships.”

And it would “negatively affect our ongoing efforts to prevent civilian casualties and prevent the spread of terrorist organizations such as Al-Qaeda in the Arabian Peninsula and ISIS, and embolden Iran’s malign activities in Yemen,” Trump said, referring to two Sunni Muslim militant groups and his Shiite bete noire.