The US foreign policy establishment is set for one of the biggest shake-ups in years as Donald Trump has vowed to both revamp US policy abroad and to root out the so-called “deep state” by firing thousands of government workers – including those among the ranks of America’s diplomatic corps.

Trump’s electoral victory is also likely to push the Biden administration to speed up efforts to support Ukraine before Trump can cut off military aid, hamper the already-modest efforts to restrain Israel’s Benjamin Netanyahu in Gaza and Lebanon and lead to a fresh effort to slash and burn through major parts of US bureaucracy including the state department.

Trump backers have said he will be more organised during his second term, often dubbed “Trump 2.0”, and on the day after election day US media reported that Trump had already chosen Brian Hook, a hawkish State Department official during the first Trump administration, to lead the transition for America’s diplomats.

And yet analysts, serving and former US diplomats and foreign officials said that it remained difficult to separate Trump’s bluster from his actual plans when he takes power in January. What is clear is that his priority is to bin many of the policies put in place by his predecessor.

“I’m skeptical that the transition process will be super-impactful since the natural instinct of the new team will be to toss all of Biden’s foreign policy in the dumpster,” one former senior diplomat said.

“If you go back to 2016, Mexico didn’t pay for the wall. And, you know, it doesn’t look like there was a secret plan to defeat Isis,” said Richard Fontaine, the CEO of the Center for a New American Security thinktank. “Some of these things didn’t turn out the way that they were talked about on that campaign trail and we go into this without really knowing what the president’s proposal will be for all of this – and what he will do.”

One clear priority, however, is to target many of those involved in crafting US foreign policy as part of a broader purge of the US government.

Trump has vowed to revive Schedule F, a designation that would strip tens of thousands of federal employees of their protections as civil servants and define them instead as political appointees, giving Trump immense powers to fire “rogue bureaucrats”, as he called them in a campaign statement.

Within the State Department, there are concerns that Trump could target the bureaus that focus specifically on issues that he has attacked during his reelection campaign such as immigration. In particular, he could slash entire bureaus of the State Department, including the bureau of population, refugees and migration (PRM, which resettled 125,000 refugees to the US in 2022 alone), as well as the bureau of democracy, human rights and labor, which has focused on the violation of the rights of Palestinians by Israel.

Project 2025, a policy memo released by the conservative Heritage Foundation, suggested that Trump would merely reassign PRM to shift resources to “challenges stemming from the current immigration situation until the crisis can be contained” and said it would demand “indefinite curtailment of the number of USRAP [United States refugee admissions program] refugee admissions”.

But the blueprint, authored by Kiron Skinner, a former director of policy planning at the State Department during the first Trump administration, went further, suggesting that Trump could simply freeze the agency’s work for a complete reevaluation of its earlier policy.

“Before inauguration, the president-elect’s department transition team should assess every aspect of State Department negotiations and funding commitments,” a section of the memo said. After inauguration, Skinner wrote, the secretary of state should “order an immediate freeze on all efforts to implement unratified treaties and international agreements, allocation of resources, foreign assistance disbursements, domestic and international contracts and payments, hiring and recruiting decisions, etc” pending a review by a political appointee.

“Everyone is bracing [themselves],” said one diplomat stationed abroad. “Some [diplomats] may choose to leave before he even arrives.”

Trump has also vowed to “overhaul federal departments and agencies, firing all of the corrupt actors in our national security and intelligence apparatus”.

As Joe Biden enters his lame duck period, the administration will focus on trying to push through $6bn in aid that has already been approved for Ukraine, as well as exerting whatever leverage remains in his administration to find an unlikely ceasefire in Gaza.

At the same time, they will have to calm a nervous world waiting to see what Trump has planned for his second term.

“I think they’re going to do everything they can to make the case that the United States needs to continue to aid Ukraine, and they’ll have to spend a lot of time, I’m sure, dealing with nervous Ukrainians and nervous Europeans,” said Fontaine. At an upcoming G20 summit in Rio, the current administration was “going to try to reassure the rest of the world that a lot of the things that they have done over the past four years are going to stick into the future rather than just be kind of undone”.

“And,” he added, “we’ll see what the reaction to that is.”