(NBC News) — Fox News personality Tucker Carlson is facing intense scrutiny from extremism experts, media watchdogs and progressive activists who say there is a link between the top-rated host’s “great replacement” rhetoric and the apparent mindset of the suspect in the weekend’s deadly rampage in Buffalo, New York.

The white suspect accused of killing 10 people and wounding three others Saturday at a supermarket in a predominantly Black neighborhood apparently wrote a “manifesto” espousing the white supremacist “great replacement” conspiracy theory — elements of which Carlson has pushed on his weeknight show.

The theory baselessly holds that a cabal of Jewish people and Democratic elites are plotting to “replace” white Americans with people of color through immigration policies, higher birth rates and other social transformations. The idea circulated on the far-right fringes before moving to the mainstream of conservative media.

“Tucker Carlson has made comments that directly reference this conspiracy theory on his show,” said Michael Edison Hayden, a spokesman for the Southern Poverty Law Center, an organization that tracks white supremacy, hate groups and extremism.

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