A recent survey conducted in the US found that 76 percent of Americans believe the ongoing US-Iran war has proven more challenging than the Trump administration expected, CBS News reported on Sunday.

The survey was conducted by CBS News and YouGov between July 22 and 24.

According to the survey, 58 percent of respondents said they felt uncertain about the ongoing conflict, while 57 percent reported feeling frustrated. In addition, 36 percent expressed pessimism, whereas only 19 percent said they felt optimistic.

The survey also found that 20 percent of respondents believed the war had unfolded as expected, while 4 percent believed it had proven easier than expected.

Regarding the balance of the conflict, 40 percent of respondents believed the US was in the more advantageous position, while 38 percent said neither side held an advantage.

Meanwhile, 22 percent believed Iran was in the more advantageous position.