Mike Waltz almost certainly will not make his debut as U.S. President Donald Trump's U.S. ambassador to the United Nations during a gathering of world leaders next week after delays and procedural hurdles postponed his confirmation.

Waltz's nomination was sent back to the U.S. Senate Foreign Relations Committee last week after Democrats blocked more than two dozen of the Republican president's executive branch nominees.

Waltz's nomination passed again on Wednesday, with one Democrat joining nearly all Republicans to advance him to the Senate floor. But it still remains all but impossible that he would be confirmed by the full chamber before the high-level General Assembly meeting starts on Monday.

"Senate Democrats' extension of their blockade on President Trump's nominations is a dete

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