Presidential candidates often make promises about what theyd do on day one in the White House, highlighting their priorities and suggesting theyd immediately fix something. Several Democrats running in 2020 have said they would act quickly to reverse the Trump administrations immigration policies. Others have promised to use their executive power to start fighting climate change.

Heres what HuffPost found out about the first day plans of the 11 leading candidates (defined as those polling at 1% or more in Real Clear Politics polling aggregate). All of them have qualified for the second presidential debate this week:

Former Vice President Joe Biden

During his first day in office, Biden would be focused on tax reform and climate change. He has said he would act swiftly to:

Eliminate the tax cuts implemented under the Trump administration.

Close $400 billion to $500 billion worth of tax loopholes that he said have no redeeming social value and then put that money to good use.

Sign a series of climate-focused executive orders that would surpass the environmental efforts of the Obama administration and put the U.S. on track to achieve a 100% clean energy economy and net-zero emissions no later than 2050.

Rejoin the Paris climate agreement , invest in infrastructure that can withstand the effects of climate change and use every tool at his disposal to advance renewable energy and biofuels.

Sen. Elizabeth Warren (D-Mass.)

Warren told Vox that on her first day in office, shed be doing what a president can do solo: Look at the tools in the toolbox. What are the ones that a president can do I love this word by herself? Her plan for day one includes the following actions:

Sign a set of executive orders that put a total stop to new fossil fuel leases, such as those for mining in national parks and drilling on federal land and offshore. The orders would also set up a program to create jobs repairing the infrastructure of national parks.

Implement the Equal Opportunity Executive Order she proposed in July. It would help close the pay gap for women of color by boosting wages under federal contracts and creating programs that enable those women to become leaders in the federal workforce.

Pick a secretary of education who had been a public school teacher and an Environmental Protection Agency administrator who wasnt a coal lobbyist . Warren has also committed to appointing government regulators who will work to unwind anti-competitive mergers.

Reverse course on the Trump administrations immigration agenda by revoking the so-called Muslim ban and immediately expanding protections for immigrants. She has also promised to reinstate the Deferred Action for Childhood Arrivals (DACA) program, improve protections for Dreamers and their families, and revive the use of the Temporary Protected Status and Deferred Enforced Departure programs.

Sen. Bernie Sanders (I-Vt.)

Sanders presidential platform lists 24 issues that he is focusing on, but so far he has made only one promise about his first day in office. On Day One, we take out our executive order pen and we rescind every damn thing that Trump has done, Sanders said during the first Democratic debate.