Thread by @jseldin

Happening now: @DHSgov @SecMayorkas speaks at @csis_isp

"We face a new kind of warfare,no longer constrained by borders or military maneuvers" @SecMayorkas tells @csis_isp, using #NotPetya as a prime example

"We face a very different world than the one our then-new Department of Homeland Security entered in 2003, nearly 20 years ago"

"Ubiquitous cutting-edge technologies, economic & political instability, and our globalized economy have erased borders & increasingly bring threats & challenges directly into our communities" per @SecMayorkas "Our homeland security has converged w/our broader nat'l security"

"#Russia has a wider range of tools to use against its perceived adversaries than it did 20 years ago - all of which have the capacity to create harm here at home" per @SecMayorkas

"We know the potential for #Russia to execute #cyberattacks aimed at undermining our economy & our critical infrastructure & to execute information influence operations designed to exacerbate societal friction, sow discord & undermine public trust" per @SecMayorkas

"These tools are not limited to #Russia" per @SecMayorkas "#China has both the capability & intent to challenge the rules-based int'l order, leveraging its instruments of nat'l power to undermine the security of our critical infrastructure..."

"...to gain access to our technology & data, to assault human rights & to undercut American workers & businesses" per @SecMayorkas

"As the threats have evolved, the historical distinction between homeland security and national security challenges has blurred and the role of DHS has grown accordingly" per @DHSgov @SecMayorkas

#Immigration - @DHSgov "operating within a system that everyone agrees is broken and that Congress must address now, at a time when we are seeing historic migration throughout the hemisphere and around the world" per @SecMayorkas

Counterterrorism-"We are confronted w/an increasingly complex & dynamic set of terrorism challeneges both at home & around the world" per @SecMayorkas

US must build on advanced tech/passenger screening tech to counter #ISIS, #alQaida, he says

Domestic violent extremism "has emerged as 1 of the greatest terrorism-related threats to the homeland" per @SecMayorkas

Says @DHSgoc "will continue to expand" work w/state & local partners

#Cyber - "W/a keystroke, our adversaries can disrupt power or water to a small city, mine troves of American's personal data or steal intellectual property" per @SecMayorkas

"Even the smallest organizations stand on the front lines, defending against the most sophisticated nation states & non-nation state threats" per @SecMayorkas

Beyond #cyber, "Our enforcement agencies are waging the fight against transnational criminal organizations on an unprecedented scale" per @SecMayorkas

"While the acquisition of 1 small US company by a Chinese company may not pose outsized national security risks, successive small investments across the sector could give #China a foothold to exploit & appropriate key technology & intellectual property" per @SecMayorkas

"Extreme #weather events have existed, have occurred in this country for years & years" per @SecMayorkas

"But the gravity & frequency of the events we are experiencing now is unprecedented"

NEW: @DHSgov has undertaken "a significant review" looking at "addressing individuals who follow extremist views within our ranks that imperil the integrity of our work or that could potentially have a nexus to violence" per @SecMayorkas

"We developed recommendations" per @SecMayorkas, adding the need to keep looking at domestic violent extremism within the ranks "has to be an ongoing one"

#Immigration: "The immigration system, our laws, have not been reformed for more than 40 years" per @SecMayorkas

"The problem from administration to administration regardless of party, is the fact that we are fundamentally working within a broken immigration system"

"What we are experiencing at the border today is unique bcs of the fact that what we are experiencing is not something exclusive to our souther border" per @SecMayorkas

"It is something that our entire hemisphere is experiencing"

"We are seeing migration that is unprecedented in scope...around the world" per @SecMayorkas

Points to situations in #Venezuela #Colombia #CostaRica #Nicaragua

NEW: "Some infrastructure was attacked - it appears to have been deliberate" per @SecMayorkas on attacks on power substations in #NorthCarolina

"Early evidence suggests it was deliberate" he says "We are working with energy companies & local communities"