An early goal of the Trump administration, as reflected in Trump’s first executive order, was the repeal of Obamacare (the Affordable Care Act, or ACA), which Trump had long derided—even before announcing his presidential bid—as an expensive failure. Trump pledged during his campaign that he would replace the ACA with a bill that would provide better coverage at lower premiums, and he promised that no one would lose health insurance under his plan. However, the details of the bill, called in the House of Representatives the American Health Care Act (AHCA), proved contentious even within his own party. Because Trump had not worked out a specific plan of his own, he was forced to rely on Republicans in the House to draft a substantive bill that would reduce government involvement in the health insurance market without depriving millions of Americans of the coverage they had acquired under the ACA. The Republicans did not have a detailed alternative in hand, however, resulting in a delay in Trump’s promised repeal of the law.

In early March 2017 House Republicans introduced their plan, which featured elimination of the ACA’s “individual mandate” (the requirement that most Americans obtain health insurance or pay a penalty), a reduction in individual tax credits for the purchase of insurance, cuts in federal Medicaid funding, and nearly $1 trillion in tax cuts over a 10-year period, including $274 billion in cuts for persons earning at least $200,000 a year. The Congressional Budget Office (CBO) initially estimated that the plan would reduce the federal deficit by $337 billion over 10 years as compared with current law but would also increase the number of uninsured people by 24 million over the same period. The bill immediately faced objections from both moderate and conservative Republicans. The former worried that too many people would lose affordable coverage, while the latter complained that the plan left too many burdensome provisions of the ACA in place. The anxieties of moderates in particular were amplified by the angry feedback they received at town hall meetings throughout the country from constituents who feared the loss of their health insurance. Unable to bridge the differences between the two factions, in late March the House leadership withdrew the bill without a vote—a major defeat for Trump, who had made repeal and replacement of the ACA a centerpiece of his campaign.

Six weeks later the House narrowly passed a revised version of the AHCA over the unanimous opposition of Democrats. A subsequent CBO analysis projected that the new version would reduce the deficit by $119 billion over 10 years as compared with current law and increase the number of uninsured people by 23 million.

Soon after the AHCA was passed, Republicans in the Senate, working largely in secret and without input from Democrats, began crafting their own replacement for the ACA, initially called the Better Care Reconciliation Act (BCRA). Like the AHCA, the BCRA, in numerous versions under various names, would have decreased the deficit but significantly increased the number of uninsured, and it would have increased insurance premiums in the first year after its passage, according to analyses released by the CBO in late June. The BCRA thus faced the same criticisms that had beset the House measure, revealing deep divisions between Senate Republicans who wished to limit the loss of health insurance in their states and those who aimed to dismantle as much of the current law as possible. Eventually, within a single week in late July, the Senate voted on three bills: a repeal of major provisions of the ACA without immediate replacement; a relatively comprehensive repeal and replacement of the ACA; and a more modest “skinny” repeal and replacement. Despite considerable political pressure on Senate Republicans from the Trump administration, all three measures failed.

Having been unsuccessful in their attempts to repeal and replace the ACA, Republicans in Congress and the Trump administration pursued a series of measures intended to cumulatively undermine the law by making the health insurance it provided less accessible, less affordable, and less effective (through reductions in coverage and other measures), a strategy that Trump described as allowing Obamacare to “explode.” Those changes, some of which predated the failure of Republican alternatives to the ACA in the Senate, included cutting funding for advertising and for assistance with enrollment in Obamacare; drastically reducing open enrollment periods; ending cost-sharing subsidies that enabled insurance companies to reduce out-of-pocket expenses for low- and middle-income Americans; and repealing (effective in 2019) the ACA’s “individual mandate,” which had required all Americans to obtain health insurance or pay a penalty. (The last measure was part of Republican tax legislation drafted in secret and passed without Democratic support in December 2017; Trump signed the measure later that month. A subsequent analysis by the CBO determined that the legislation, which among other things reduced the corporate tax rate from 35 to 21 percent, would increase the federal deficit by approximately $1.8 trillion over a 10-year period.) In November 2017 a study by the CBO had estimated that repealing the individual mandate and making no other changes to the ACA would increase the number of uninsured people by 13 million after 10 years and raise premiums by 10 percent in most years through 2027. Other changes included allowing states to impose work requirements on people receiving Medicaid; allowing the creation of “association health plans” that would offer fewer essential health benefits than plans under the ACA and charge higher premiums to certain enrollees based on factors such as gender, occupation, and age; and permitting the sale of short-term plans that would provide minimal benefits and would not cover medical services for preexisting conditions.

Environmental policy

One of the areas in which the Trump administration was able to move quickly to implement its policies was the environment, in part because many of the changes it sought could be accomplished through executive action by Trump or his appointees. Other changes were undertaken through legislation adopted by Congress, whose Republican majority generally shared Trump’s environmental views. In January, for example, Trump signed memoranda to hasten approval and completion of the Dakota Access and Keystone XL oil pipelines, both of which had been blocked by the Obama administration on environmental grounds. In February Trump signed legislation to block an Interior Department rule that would have restricted the dumping of toxic mining waste into streams and other waterways. In March Trump signed an executive order that rescinded various Obama-era policies and programs related to climate change, including a 2016 freeze on new coal leases on federal lands. In the same month, EPA administrator Pruitt withdrew an EPA request that oil and natural gas companies report methane emissions from their facilities and rejected a total ban on the pesticide chlorpyrifos, against the advice of the EPA’s own scientists. Other significant decisions included drastically reducing the size of national monuments created by Presidents Obama and Clinton; rescinding the Obama administration’s Clean Power Plan, a set of EPA regulations that had mandated a 32 percent reduction in carbon emissions by the U.S. power sector between 2005 and 2030; revoking fuel-efficiency standards for cars and light trucks developed by the EPA during the Obama administration; and proposing numerous changes to the Endangered Species Act (ESA) that would weaken legal protections for endangered and threatened animals and make listing species as threatened more difficult.

Undoubtedly the most momentous environmental decision of the new Trump administration was Trump’s announcement in June that the United States would withdraw from the Paris Agreement on climate change, under which the United States and 194 other countries had agreed to a broad range of measures intended to limit potentially catastrophic increases in global average temperatures during the 21st century and to mitigate the economic consequences of global warming. Trump contended that the agreement would harm the American economy (through government-mandated reductions in the country’s greenhouse gas emissions) and was in other respects unfair and even demeaning to the United States—historically the largest emitter of greenhouse gases and in the early 21st century the second largest emitter after China. Trump’s decision was condemned by government and political leaders, scientists, business executives, and activists throughout the world but praised by Republicans in Congress, who viewed it as a reassertion of American independence in world affairs and a repudiation of the environmental policies of the Obama administration. Like Trump, many Republican lawmakers doubted that climate change was real, while others acknowledged its reality but questioned the human origins of global warming.