Following his sweeping electoral victory in November, President-elect Donald Trump is reportedly preparing 100 executive orders for his first day in office, mostly centered on securing the nation’s neglected southern border.

In an interview Thursday, Trump ally and Republican Senator Markwayne Mullin (Okla.) discussed the president-elect’s plans. “He says he has almost 100 executive orders that will go a long ways towards securing the border again and also put the energy sector back in play again and actually build a … ‘drill, baby, drill’ process where we can become energy-independent again.” Mullin added, “All that can be done through executive order, but, as he said, it’s not permanent” without congressional support.

Newly-minted GOP Senate Majority Leader John Thune (S.D.) also emphasized that congressional Republicans must deliver on Trump’s agenda. “This past November, the American people gave President Trump and Republicans a mandate. Now the time has come to begin executing on it,” Thune said in a floor speech Wednesday. Noting the incoming Trump administration’s focus on border security, he continued, “One of the most important issues in this last election was the illegal immigration crisis. … For the last four years, the Biden administration’s open-border policies have wreaked havoc in both border communities and those far from the border.”

Republicans in the House are also looking to grant congressional permanence to Trump’s immigration policies. On Thursday, Rep. Brandon Gill (R-Texas) introduced a bill to reinstate the “Remain in Mexico” policy previously employed under Trump’s first administration. The legislation would reverse the Biden administration’s “parole” program and require those seeking or claiming asylum in the U.S. to await their appointed court dates in Mexico, instead of releasing migrants into the U.S.

According to an Axios report, Trump and several of his closest policy advisors met with GOP senators late Wednesday and unveiled roughly 100 planned executive orders, mostly focused on border security and immigration. Stephen Miller, an immigration hardliner and Trump’s homeland security advisor and deputy chief of staff for policy, shared that likely executive actions included reinstating Title 42, which allows for the rapid expulsion of illegal immigrants under public health concerns; continuing construction of the border wall, a policy Miller is credited with devising; and utilizing part of the Immigration and Nationality Act to allow state and local law enforcement to assist Immigration and Customs Enforcement (ICE) with detaining and deporting illegal immigrants, a key promise of Trump’s successful 2024 campaign.

Trump’s mass deportation plans have consistently garnered widespread support across the nation. Surveys from both April and September of last year found that over half of Americans endorse the mass deportation of illegal immigrants. While some Democratic officials, including mayors and governors, have vowed not to cooperate with ICE to deport illegal immigrants — or, in some cases, have suggested even outright opposing federal deportation efforts — a recent poll found that a supermajority of voters in even deep-blue Democratic stronghold such as Maryland support requiring state and local law enforcement to work with ICE in carrying out deportations. Overall, 76% of Marylanders — including 96% of Republicans, 77% of Independent voters, and even 65% of Democrats — want state and local authorities to cooperate with ICE in deporting illegal immigrants who have committed crimes.

A number of prominent Democrats have recently shifted their positions on deportations, from full-throated support for “sanctuary cities” to promising to aid ICE. Governors J.B. Pritzker (Ill.) and Jared Polis (Colo.) and mayors like Eric Adams of New York City have abandoned opposition to ICE’s deportation program — Adams has even pledged his support — after initially indicating opposition. Even Governor Kathy Hochul (N.Y.) said that she would be the “first one to call up ICE” to manage deportations in her state.

According to the Center for Immigration Studies (CIS), California, Colorado, Connecticut, Illinois, Massachusetts, New Jersey, New York, North Dakota, Oregon, Rhode Island, Utah, Vermont, and Washington are all currently considered “sanctuary” states. There are also 157 counties and 45 cities across other states listed as “sanctuary cities” as of this week.