GPT added a caveat to the Biden list; on the Trump list it adds none.

If “failure” means a major objective not achieved, poor execution, or an avoidable loss of public trust, the strongest cases are:

• 1.The chaotic withdrawal from Afghanistan
• •The Taliban retook Kabul before the withdrawal was complete, producing a frantic airport evacuation.
• •Thirteen U.S. service members and roughly 170 Afghan civilians were killed in the Abbey Gate bombing.
• •Many Afghan partners were left behind, and the episode damaged perceptions of U.S. competence. Biden inherited the withdrawal agreement from Trump, but his administration controlled its execution.

• 2.Inflation and the cost-of-living crisis
• •Inflation reached 9.1% in June 2022, the highest rate in four decades, with food, housing, and energy costs hitting households especially hard.
• •Pandemic disruptions and Russia’s invasion of Ukraine were major causes, but the $1.9 trillion American Rescue Plan probably added to demand and inflation.
• •Inflation later declined, but prices remained substantially above 2021 levels, and the administration was slow to recognize the political severity of the problem.

• 3.Failure to manage the southern border and asylum system
• •Border encounters reached record levels, while asylum backlogs and pressure on cities intensified.
• •The administration initially reversed Trump-era restrictions without having sufficient processing, detention, adjudication, or removal capacity in place.
• •Biden adopted tougher measures only late in his term. Congress also bears responsibility: immigration law remained unreformed, and Republicans ultimately blocked a bipartisan 2024 border bill.

• 4.Poor handling of Biden’s age and fitness concerns
• •The White House minimized concerns about Biden’s stamina and public performance until his June 2024 debate made them impossible to dismiss.
• •His late withdrawal from the presidential race left Democrats little time to conduct a competitive nomination process or develop a replacement campaign.
• •Whatever one thinks of his record, the lack of transparency seriously damaged public trust and contributed to Democratic electoral defeat.

• 5.An inconsistent and ineffective Gaza policy
• •Biden continued extensive military and diplomatic support for Israel while repeatedly failing to translate U.S. leverage into adequate civilian protection or sustained humanitarian access.
• •His administration’s stated goals—protecting civilians, limiting regional escalation, freeing hostages, and ending the war—often conflicted in practice.
• •It helped secure a ceasefire and hostage agreement at the very end of his term, but only after enormous civilian suffering and major damage to U.S. credibility, particularly in the Arab world and among younger Americans.

• 6.Failure to deter Russia’s invasion or produce a favorable end state in Ukraine
• •Biden successfully rallied NATO and organized large-scale support for Ukraine, so this is a mixed record rather than a simple failure.
• •Nevertheless, deterrence failed in February 2022, aid was often delayed or constrained by escalation fears, and the war remained unresolved when Biden left office.
• •Critics argue the incremental approach gave Russia time to fortify occupied territory; defenders contend it prevented direct NATO-Russia war.

• 7.Overpromising on domestic reform
• •Biden failed to enact major promises on immigration, voting rights, a public health-insurance option, national paid leave, expanded child care, and broad police reform.
• •“Build Back Better” was dramatically reduced before becoming the Inflation Reduction Act.
• •Narrow congressional margins and opposition from both Republicans and centrist Democrats were decisive constraints, but the administration often advertised ambitions it could not deliver.

• 8.Reliance on legally vulnerable executive actions
• •The Supreme Court struck down Biden’s original broad student-loan cancellation plan and blocked the OSHA vaccine-or-test mandate for large employers.
• •These defeats suggested inadequate attention to legal limits and created expectations that could not be fulfilled.
• •The administration later delivered narrower student-debt relief through existing programs, but not the sweeping cancellation initially promised.

• 9.Uneven post-pandemic governance and messaging
• •The administration underestimated the persistence of COVID-19, faced testing shortages during the Omicron wave, and issued messaging that sometimes appeared contradictory.
• •School-learning loss, absenteeism, and public distrust remained major problems without a sufficiently forceful federal recovery strategy.
• •Many underlying decisions were state and local rather than federal, but Biden had explicitly promised greater competence and clarity.

• 10.Damage to ethical credibility from Hunter Biden’s pardon
• •Biden repeatedly said he would not pardon his son, then issued a broad pardon covering nearly eleven years.
• •Even if concerns about selective prosecution had merit, reversing that promise reinforced perceptions that political elites operate under different rules.

The most consequential failures were probably Afghanistan, inflation, the border, and the handling of Biden’s age and reelection decision. Some other areas—especially Ukraine and the economy—were mixed records containing substantial successes alongside clear failures.

Assuming you mean Trump’s first administration (2017–2021), the most consequential failures—judged by outcomes, institutional damage, and failure to meet stated goals—include:

• 1.COVID-19 response
• •The administration accelerated vaccine development through Operation Warp Speed, but its broader response was undermined by delayed testing, inconsistent federal coordination, shortages, pressure to reopen prematurely, and Trump’s repeated minimization of the threat.
• •Roughly 400,000 Americans had died from COVID-19 by the time he left office.

• 2.Attempt to overturn the 2020 election
• •Trump refused to accept a verified electoral defeat, pressured state officials and the Justice Department, promoted unsupported fraud claims, and sought to block certification.
• •These efforts culminated in the January 6 Capitol attack and severely damaged confidence in elections and the peaceful transfer of power.

• 3.Family separation and ineffective immigration policy
• •The “zero tolerance” policy separated thousands of children from their parents, often without adequate systems for reunification.
• •Despite harsh enforcement measures, the administration did not achieve comprehensive immigration reform, and Trump’s promised border wall was only partially built; much of the construction replaced existing barriers.

• 4.Large deficits despite a strong pre-pandemic economy
• •The 2017 tax cuts substantially reduced federal revenue and did not pay for themselves as promised.
• •Budget deficits increased even before COVID-19, while the benefits of the tax law were disproportionately concentrated among corporations and higher-income households.

• 5.Failure to repeal and replace the Affordable Care Act
• •Trump repeatedly promised a superior, less expensive healthcare plan but never produced a comprehensive replacement.
• •His administration also supported litigation that could have invalidated the ACA without establishing a workable alternative.

• 6.Withdrawal from the Iran nuclear agreement
• •Trump abandoned the agreement even though international inspectors reported that Iran was complying at the time.
• •The resulting “maximum pressure” campaign did not produce a stronger deal; Iran subsequently expanded its nuclear activities and moved closer to weapons-grade enrichment.

• 7.Little lasting progress with North Korea
• •Trump’s summits with Kim Jong Un were historically unusual but produced no verified denuclearization agreement.
• •North Korea continued developing nuclear weapons and ballistic missiles while gaining international legitimacy.

• 8.Trade wars that failed to achieve their main objectives
• •Tariffs on China raised costs for American importers and consumers and prompted retaliation against U.S. farmers, requiring tens of billions of dollars in federal aid.
• •The bilateral trade deficit and many structural concerns about Chinese economic policy remained unresolved.

• 9.Environmental and climate-policy reversals
• •The administration withdrew from the Paris climate agreement and weakened numerous pollution and emissions rules.
• •These actions delayed U.S. climate efforts, increased regulatory uncertainty, and reduced American credibility in international climate negotiations.

• 10.Poor governance and administrative instability
• •The administration experienced exceptionally high senior-staff turnover, extensive reliance on acting officials, repeated ethics controversies, and inconsistent policymaking.
• •Several signature promises—including a major infrastructure program and broad governmental reform—were announced repeatedly but not enacted.

• 11.Handling of Puerto Rico after Hurricane Maria
• •Federal disaster preparation and relief were widely criticized as slow and inadequate. A later Department of Housing and Urban Development inspector-general report found that political considerations delayed billions in recovery assistance.
• •Trump also repeatedly disputed the documented death toll.

• 12.The Afghanistan withdrawal agreement
• •The 2020 Doha agreement set a withdrawal timetable, excluded the Afghan government from negotiations, and secured major Taliban concessions without obtaining a durable political settlement or enforceable ceasefire.
• •The final collapse occurred under President Biden, but the agreement significantly narrowed the successor administration’s options.

The precise ranking is debatable, but COVID-19, the effort to overturn the election, fiscal deterioration, family separation, and the weakening of U.S. alliances and nonproliferation policy are generally among the most consequential.