'Our generosity will not be taken advantage of': US reduces aid to UN by $285 million after voting against Trump on Jerusalem

The United Nations' budget is set to shrink by over $285 million next year - a 5 percent cut that the U.S. government says it negotiated.

The U.N. General Assembly voted Sunday to approve the nearly $5.4 billion regular operating budget for 2018-2019. The Secretary-General's office says the new budget include cuts to most departments and offices.

The regular budget pays for many U.N. activities, but not peacekeeping or some humanitarian appeals, for example.

The U.S. is the largest contributor, paying about 25 percent of the regular budget. President Donald Trump has pressed to cut U.S. contributions to the world body.

In a statement Sunday, U.S. Ambassador Nikki Haley faulted the U.N. for "inefficiency and overspending" and said Washington won't let "the generosity of the American people be taken advantage of."

She also said that while the mission was pleased with the results of budget negotiations, it would continue to 'look at ways to increase the U.N.'s efficiency... while protecting our interests.'

The requested budget cuts came after the UN General Assembly voted to reject the Trump administration recognition of Jerusalem as Israel's capital earlier this month.

AP contributed to this report