Charted: Secret Service's plummeting approval rating

The Secret Service's approval rating plummeted 23 points in a new Gallup poll largely conducted before the second assassination attempt on former President Trump just over a week ago.

Why it matters: Public opinion of the agency has cratered since the first assassination attempt on Trump in July, which sparked bipartisan backlash over security lapses.

• Acting Secret Service Director Ronald Rowe said last week that personnel would face disciplinary action over the failure to secure the Butler, Pennsylvania site of the rally shooting.

By the numbers: The poll found that the percentage of adults who say the Secret Service is doing an excellent or good job dropped to a 10-year low.

• Now, only 8% of U.S. adults rate the agency's performance as "excellent" and 24% say it is "good."

Zoom in: Among self-identified Republicans and Republican leaning respondents, just 20% give the agency a positive rating — the lowest figure for the group to date.

• Among Democrats and Democratic leaners, the approval rating dropped by 18 points, to 47%.

Flashback: In 2014, just 43% of respondents rated the secret service as excellent or good after a series of security lapses, including an intruder who jumped the White House fence and entered the building.

Zoom out: Gallup's poll also measured American's perceptions of 14 other government agencies and departments.

• Just one received positive ratings from a majority of Americans: the U.S. Postal Service.
• Less than 35% rated eight of the government agencies as excellent or good.

The big picture: The next challenge for the embattled agency: This week's UN General Assembly (UNGA), the annual diplomatic pilgrimage that brings more than 140 world leaders to Manhattan.

• The agency — under a cloud after a July assassination attempt on former President Trump — is confident in its multi-layer, multi-agency plan to protect UNGA, which is deemed a Super Bowl-level National Special Security Event, AP reports.
• Beyond motorcades and protective details, the plan includes NYPD helicopters and patrol boats, a dozen UN security K-9 teams sweeping for explosives, road closures and traffic diversions.
• The Secret Service is bringing in agents from posts around the world.

Methodology: The poll of 1,007 adults was conducted Sept. 3-15 via telephone interviews. It has a margin of error of +/- 4 percentage points.

Go deeper: Biden says Secret Service "needs more help"