Polls taken of citizens in other countries show a sharp drop in respect for the United States government. Donald Trump is simply not respected as past presidents have been.
And most Americans realize that. About 68% of the general population and 87% of Democrats believe the U.S. is less respected by other countries today as compared to the past. The Republicans polled show less belief in that, but even with them a plurality understands the U.S. is less respected (42% to 29%).
The U.S. used to be the leader of the "free world", but that is no longer true. With Trump as president, other countries (even those traditionally viewed as our allies) no longer have faith in the leadership of the United States.
The chart above is from a recent poll done by the Pew Research Center between October 25th and 30th of a random national sample of 1,504 adults, with a 2.9 point margin of error.