EXCLUSIVE: Inside the Relentless Rise of Donald Trump's Immigration Bulldog Stephen Miller — After He Was 'Dismissed' by Military Bosses

Drawing on extensive interviews with anonymous officials involved in the administration, the book examines how Trump, 80, has consolidated executive power during his second term and reveals how Miller's influence expanded dramatically after holding a far less commanding role during Trump's first presidency.

A source familiar with the administration's internal dynamics told us: "Stephen Miller has become the undisputed enforcer of the president's immigration agenda. People who once underestimated him now recognize that few major domestic policy decisions move forward without his approval."

Another source added: "His authority has grown to a level that surprises even longtime Trump allies. He has positioned himself at the center of the administration's most controversial priorities."

The book describes Trump as the "most powerful president of our lifetimes" and portrays him as a leader operating on "grievances and instincts," whose approach to governing frequently disregards long-standing political norms.

It also recounts an episode in which Trump was found decorating parts of the White House using a tube of super glue.

Haberman and Swan write their reporting involved extensive efforts to contact the people named in the book and offered them opportunities to provide their perspectives.

The authors add their account is based on interviews conducted on the condition of anonymity because of the sensitivity of the discussions and internal decision-making they describe.

According to the book, Miller was a highly visible architect of Trump's immigration crackdown during the president's first administration.

However, while still in his early 30s, the book says he could be "easily dismissed" by Trump's senior military leaders, apparently limiting his ability to shape policy across government despite his prominence on immigration issues.

That is said to have changed dramatically during Trump's second term. Although Miller's formal titles of deputy chief of staff for policy and homeland security adviser appeared relatively modest, the Regime Change authors argue they concealed the extraordinary scope of his influence inside the White House.

The book also states Miller's responsibilities stretched across much of the federal government.

He reportedly oversaw executive orders, recruited the lawyers responsible for drafting them, and played a central role in directing the Department of Homeland Security's mass deportation strategy, including pressing for the deployment of US troops in American cities.

It also alleges Miller frequently confronted subordinates in blunt terms.

During one meeting focused on increasing the pace of deportations, the book says he threatened to dismiss the entire leadership of Immigration and Customs Enforcement if results did not improve quickly enough.

The authors further claim Miller often framed his own policy preferences as direct requests from Trump while remaining noticeably restrained about expressing his personal opinions in the president's presence.

According to one source cited in the book, the approach enabled him to expand his authority while reinforcing the perception his directives carried the president's full backing.