Gemini dropped the caveat from the Trump list; on the Biden list it adds a caveat.

Assessments of presidential successes and failures are highly subjective and depend on political ideology, economic priorities, and foreign policy perspectives. However, looking at public polling, congressional oversight, and critiques from across the political spectrum—including political scientists, economists, and members of his own party—several issues stand out as the most significant challenges, vulnerabilities, or perceived failures of the Biden administration.

Here is a summary of the areas that have drawn the most substantial criticism:

1. The Execution of the Afghanistan Withdrawal (2021)
While the decision to withdraw U.S. troops from Afghanistan was initiated by the Trump administration and had broad public support, the execution of the withdrawal in August 2021 is widely viewed as a major failure of planning and intelligence. The rapid collapse of the Afghan government, the chaotic evacuation at Hamid Karzai International Airport, and the suicide bombing that killed 13 U.S. service members and over 170 Afghans drew severe bipartisan condemnation. Critics argue the administration failed to anticipate the Taliban’s speed and did not begin evacuations early enough.

2. Inflation and the Cost of Living
During Biden’s tenure, the U.S. experienced the highest rates of inflation in 40 years, peaking at 9.1% in the summer of 2022. While inflation was a global phenomenon driven by pandemic supply chain disruptions and Russia's invasion of Ukraine, critics—and some prominent economists—argued that the administration’s $1.9 trillion American Rescue Plan overstimulated the economy and exacerbated the problem. Furthermore, the administration faced significant political backlash for initially dismissing inflation as "transitory." Even as inflation later cooled, the cumulative increase in the cost of housing, groceries, and energy remained a primary source of public dissatisfaction.

3. The U.S.-Mexico Border Crisis
The Biden administration faced sustained criticism for its handling of immigration and security at the southern border, which saw record-breaking numbers of migrant encounters. Critics argue the administration rolled back Trump-era deterrent policies too quickly without a viable replacement plan, triggering a surge that overwhelmed border agents. The issue eventually drew heavy criticism not only from Republicans but also from Democratic mayors and governors in cities like New York and Chicago, who cited a lack of federal support and coordination to handle the logistical and financial strain of arriving migrants.

4. Navigating the Israel-Hamas War
The administration’s handling of the conflict in Gaza following the October 7, 2023, Hamas attacks became a major political and foreign policy vulnerability. The administration struggled to balance its historical support for Israel with mounting international and domestic outrage over the high civilian death toll and humanitarian crisis in Gaza. Biden faced intense criticism from the political right, who argued he was not supportive enough of Israel and too soft on Iran, while facing a fracture within his own party, as progressives, younger voters, and Arab-Americans condemned his continued authorization of weapon sales to Israel.

5. Messaging and Public Perception
A persistent critique of the Biden administration from within the Democratic Party was its inability to effectively communicate its legislative victories (such as the Bipartisan Infrastructure Law, the CHIPS and Science Act, and the Inflation Reduction Act) to the American public. Despite periods of strong job growth and a recovering stock market, Biden’s approval ratings remained consistently low for the majority of his presidency.

6. The Handling of Age Concerns and the 2024 Campaign
For years, the administration and campaign officials dismissed public and media concerns regarding President Biden’s age and stamina. However, following a widely criticized debate performance in June 2024, a crisis of confidence engulfed the Democratic Party. The administration's failure to quell concerns about his cognitive fitness ultimately forced Biden to withdraw from his reelection campaign just months before the election.

Summary Context:
When evaluating a presidency, critics point to the issues above as defining failures, highlighting economic strain, border management, and foreign policy crises. Conversely, supporters argue these challenges must be weighed against the administration's legislative record, the stewardship of the post-pandemic economic recovery, and efforts to unify Western alliances, demonstrating how presidential legacies are viewed through competing lenses.

When evaluating the "failures" of any presidential administration, political scientists, historians, and policy analysts typically look at unfulfilled campaign promises, unintended negative consequences of policies, and disruptions to institutional stability.

Because political views are highly polarized, what critics view as a failure, supporters sometimes view as a success or a necessary disruption. However, based on bipartisan critiques, historical analysis, and the administration’s own stated goals, the following are widely cited as the most significant failures and shortcomings of the Donald Trump administration (2017–2021):

1. Unfulfilled Major Legislative Promises

• •Repeal and Replace Obamacare: One of Trump’s primary campaign promises was to entirely repeal and replace the Affordable Care Act (ACA). Despite holding majorities in both the House and the Senate during his first two years, the administration failed to pass a repeal or offer a comprehensive replacement healthcare plan.
• •Infrastructure: The administration repeatedly promised a massive, trillion-dollar infrastructure bill to rebuild American roads, bridges, and airports. Despite declaring multiple "Infrastructure Weeks," the administration never managed to pass comprehensive infrastructure legislation.

2. The National Debt and Deficit
Trump campaigned on a promise to eliminate the national debt over eight years. Instead, the national debt increased by nearly $7.8 trillion during his single term. While a significant portion of this was due to emergency bipartisan spending during the COVID-19 pandemic, the deficit was already rising substantially prior to 2020. This was largely driven by the 2017 Tax Cuts and Jobs Act, which reduced revenue without corresponding spending cuts, a point of heavy criticism from fiscal conservatives and economists.

3. Handling of the COVID-19 Pandemic
While the administration is frequently credited with "Operation Warp Speed," which successfully accelerated the development of COVID-19 vaccines, the broader management of the pandemic is widely cited by public health experts as a major failure. Critics point to the administration's early downplaying of the virus, mixed messaging regarding masks and lockdowns, public clashes with the scientific and medical communities, and the lack of a cohesive national testing or supply-chain strategy during the critical early months of the outbreak.

4. Post-Election Actions and Democratic Norms
Historians and political scientists frequently point to the aftermath of the 2020 election as a profound institutional failure. The administration's refusal to accept the election results, the promotion of unproven claims of widespread voter fraud, and the pressure campaign on state and federal officials to overturn the results culminated in the January 6th attack on the U.S. Capitol. This resulted in Trump becoming the only U.S. president to be impeached twice and drew unprecedented condemnation from members of his own party and former cabinet officials.

5. Immigration Execution and Family Separation
While border security was a cornerstone of his platform, the execution of immigration policy faced severe logistical and ethical criticisms.

• •The Border Wall: Trump promised to build a wall across the entire southern border and guaranteed that Mexico would pay for it. Ultimately, Mexico did not pay for the wall, and while roughly 450 miles of barrier were built or replaced, the vast majority was replacing existing structures rather than covering new territory.
• •Family Separation: The administration’s 2018 "zero-tolerance" immigration policy resulted in thousands of children being separated from their parents at the border. The policy provoked massive bipartisan and international backlash, leading the administration to abruptly reverse the policy, though poor record-keeping meant hundreds of children remained separated from their parents for years afterward.

6. Foreign Policy and Traditional Alliances
The administration's "America First" foreign policy led to the withdrawal of the U.S. from several major international agreements, including the Paris Climate Accord, the Iran Nuclear Deal, and the Trans-Pacific Partnership (TPP). While supporters praised this as a renegotiation of bad deals, foreign policy experts and critics argued that these withdrawals, combined with public friction with NATO allies and the withdrawal from the World Health Organization, damaged America's global standing, alienated long-time allies, and created power vacuums that countries like China and Russia attempted to fill.

7. High Turnover and Administrative Instability
The Trump administration experienced record-breaking turnover among high-level staff and cabinet members. Many key positions—including the Secretary of Defense, Secretary of State, Chief of Staff, and National Security Advisor—were turned over multiple times, often resulting in public feuds between the President and his former appointees. Critics and management experts argue this constant churn hindered the administration's ability to govern effectively, maintain institutional knowledge, or execute long-term policy goals.