Poll results released Tuesday indicate the majority of Americans are concerned that U.S. military strike against Syria will become a long and costly involvement, while multiple recent polls show opposition to the potential attack has increased over the past weeks.

A survey by the Pew Research Center and USA TODAY conducted during Sept. 4-8 showed 63 percent of Americans oppose the U.S. military action against Syria, but the percentage of opposition was only 48 percent during Aug.29 to Sept.1. On the contrary, the ratio of Americans who support the strike almost remained the same, which is less than 30 percent.

Despite the U.S. government efforts to convince lawmakers in the past weeks, poll results indicate that Democrats still continue to oppose airstrikes, as 53 percent of them don't want a military action.

Another poll conducted by NBC News/Wall Street Journal from Sept. 5-8 showed that 57 percent of Americans disapprove of the job U.S. President Barack Obama is doing in handling the situation in Syria, which was 13-percentage points smaller about a month earlier. The poll also showed that more than seven in 10 Americans think Obama's administration is doing too much in other countries around the world, and it is time to do less abroad and focus more on their own problems at home.

A result of AP/GFK survey also indicated that 54 percent Americans say they disapprove of the way Obama is handling the Syrian crisis, which is 11-percentage points higher than a previous poll.?