As the first Indian American to head the nation's top investigative organization, Director Kash Patel of the Federal Bureau of Investigation (FBI) issued a dire warning to America's adversaries at the start of his historic tenure on Thursday: "We will hunt you down in every corner of this planet."

Patel replaced Christopher Wray as the agency's ninth director, serving a stated ten-year term that ended prematurely for both of his immediate predecessors. James Comey had just finished four of his ten-year term when President Donald Trump fired him in 2017, and Wray had resigned two years before Trump was elected.

The Republican-led US Senate confirmed Patel in a narrow majority vote of 51-49, with two Republican Senators Lisa Murkowski and Susan Collins voting with all Democrats against confirming Trump's nominee.

Patel overcame their opposition and that of the Democrats, one of whom warned at a press conference outside the FBI headquarters in Washington DC, that Patel "will cause evil in this building behind us".

"I am honoured to be confirmed as the ninth Director of the Federal Bureau of Investigation," Patel wrote in the first post on X with the handle "FBI Director Kash Patel".

"The FBI has a storied legacy -- from the "G-Men" to safeguarding our nation in the wake of 9/11. The American people deserve an FBI that is transparent, accountable, and committed to justice. The politicalisation of our justice system has eroded public trust -- but that ends today."

"My mission as Director is clear: let good cops be cops -- and rebuild trust in the FBI."

"Working alongside the dedicated men and women of the Bureau and our partners, we will rebuild an FBI the American people can be proud of."

"And to those who seek to harm Americans -- consider this your warning. We will hunt you down in every corner of this planet."

"Mission First. America Always. Let's get to work."

Collins, the Republican Senator who voted against Patel, said in a statement, that Patel "has made numerous politically charged statements in his book and elsewhere discrediting the work of the FBI, the very institution he has been nominated to lead," which she said has "cast doubt on Patel's ability to advance the FBI's law enforcement mission in a way that is free from the appearance of political motivation".

Patel’s nomination was one of the most contentious made by Trump during his second term, alongside Tulsi Gabbard’s for director of national intelligence and Robert F. Kennedy Jr.’s for heading the Department of Health and Human Services. Even some Republicans expressed concerns, though most eventually supported the nominations.

A former public defender, Patel has experienced a rapid rise within Washington D.C.’s power circles in recent years. He reached prominent positions such as Chief of Staff at the Department of Defense and Deputy Director of National Intelligence during Trump’s first term.