A limitation on the president’s power to appoint ambassadors is that the Senate must approve them.
the House must approve them.
the House and Senate must approve them.
the Supreme Court must approve them.

A limitation on the president’s power to appoint ambassadors is that

the Senate must approve them.

president’s power can be regarded as the power that is been bestowed on the president according to the Constitution.

In appointment of ambassadors, under the Constitution, the Senate must approve the list after the presentation of the list by the president.

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